161642899752 has 64 divisors (see below), whose sum is σ = 404799897600. Its totient is φ = 53788712640.

The previous prime is 161642899727. The next prime is 161642899753. The reversal of 161642899752 is 257998246161.

It is a super-2 number, since 2×161642899752² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161642899753) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 48120649 + ... + 48124007.

It is an arithmetic number, because the mean of its divisors is an integer number (6324998400).

Almost surely, 2^161642899752 is an apocalyptic number.

161642899752 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161642899752 is an abundant number, since it is smaller than the sum of its proper divisors (243156997848).

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

161642899752 is a wasteful number, since it uses less digits than its factorization.

161642899752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6206 (or 6202 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 60.

The spelling of 161642899752 in words is "one hundred sixty-one billion, six hundred forty-two million, eight hundred ninety-nine thousand, seven hundred fifty-two".