161855297792928 has 72 divisors (see below), whose sum is σ = 460278195013728. Its totient is φ = 53951509003392.

The previous prime is 161855297792887. The next prime is 161855297792933. The reversal of 161855297792928 is 829297792558161.

161855297792928 is a `hidden beast` number, since 1 + 6 + 1 + 85 + 529 + 7 + 7 + 9 + 2 + 9 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64931151 + ... + 67377777.

It is an arithmetic number, because the mean of its divisors is an integer number (6392752708524).

Almost surely, 2^{161855297792928} is an apocalyptic number.

161855297792928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161855297792928 is an abundant number, since it is smaller than the sum of its proper divisors (298422897220800).

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

161855297792928 is a wasteful number, since it uses less digits than its factorization.

161855297792928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676346 (or 2676335 counting only the distinct ones).

The product of its digits is 2743372800, while the sum is 81.

The spelling of 161855297792928 in words is "one hundred sixty-one trillion, eight hundred fifty-five billion, two hundred ninety-seven million, seven hundred ninety-two thousand, nine hundred twenty-eight".