161301878340318 has 112 divisors (see below), whose sum is σ = 372616784556576. Its totient is φ = 52307229228480.

The previous prime is 161301878340307. The next prime is 161301878340329. The reversal of 161301878340318 is 813043878103161.

161301878340318 is a `hidden beast` number, since 1 + 6 + 1 + 30 + 187 + 83 + 40 + 318 = 666.

It is an interprime number because it is at equal distance from previous prime (161301878340307) and next prime (161301878340329).

It is a super-2 number, since 2×161301878340318² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 417402855 + ... + 417789117.

It is an arithmetic number, because the mean of its divisors is an integer number (3326935576398).

Almost surely, 2^{161301878340318} is an apocalyptic number.

161301878340318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161301878340318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186308392278288).

161301878340318 is an abundant number, since it is smaller than the sum of its proper divisors (211314906216258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161301878340318 is an equidigital number, since it uses as much as digits as its factorization.

161301878340318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394061 (or 394046 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 161301878340318 in words is "one hundred sixty-one trillion, three hundred one billion, eight hundred seventy-eight million, three hundred forty thousand, three hundred eighteen".