161626759830 has 128 divisors (see below), whose sum is σ = 454910860800. Its totient is φ = 40722072192.

The previous prime is 161626759807. The next prime is 161626759841. The reversal of 161626759830 is 38957626161.

161626759830 is a `hidden beast` number, since 1 + 6 + 1 + 626 + 7 + 5 + 9 + 8 + 3 + 0 = 666.

It is a super-2 number, since 2×161626759830² (a number of 23 digits) contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1871257 + ... + 1955723.

It is an arithmetic number, because the mean of its divisors is an integer number (3553991100).

Almost surely, 2^161626759830 is an apocalyptic number.

161626759830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161626759830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227455430400).

161626759830 is an abundant number, since it is smaller than the sum of its proper divisors (293284100970).

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

161626759830 is a wasteful number, since it uses less digits than its factorization.

161626759830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84875 (or 84869 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 161626759830 in words is "one hundred sixty-one billion, six hundred twenty-six million, seven hundred fifty-nine thousand, eight hundred thirty".