161631447718 has 8 divisors (see below), whose sum is σ = 261096954048. Its totient is φ = 74599129704.

The previous prime is 161631447701. The next prime is 161631447751. The reversal of 161631447718 is 817744136161.

161631447718 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161631447718² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3108297046 + ... + 3108297097.

It is an arithmetic number, because the mean of its divisors is an integer number (32637119256).

Almost surely, 2^161631447718 is an apocalyptic number.

161631447718 is a deficient number, since it is larger than the sum of its proper divisors (99465506330).

161631447718 is a wasteful number, since it uses less digits than its factorization.

161631447718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216594158.

The product of its digits is 677376, while the sum is 49.

The spelling of 161631447718 in words is "one hundred sixty-one billion, six hundred thirty-one million, four hundred forty-seven thousand, seven hundred eighteen".