161751800256 has 56 divisors (see below), whose sum is σ = 428005701264. Its totient is φ = 53912555520.

The previous prime is 161751800237. The next prime is 161751800257. The reversal of 161751800256 is 652008157161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161751800257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2691496 + ... + 2750936.

Almost surely, 2^161751800256 is an apocalyptic number.

161751800256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161751800256 is an abundant number, since it is smaller than the sum of its proper divisors (266253901008).

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

161751800256 is a wasteful number, since it uses less digits than its factorization.

161751800256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73629 (or 73619 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 161751800256 in words is "one hundred sixty-one billion, seven hundred fifty-one million, eight hundred thousand, two hundred fifty-six".