161800868736 has 128 divisors (see below), whose sum is σ = 514271066400. Its totient is φ = 49784868864.

The previous prime is 161800868711. The next prime is 161800868767. The reversal of 161800868736 is 637868008161.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×161800868736² (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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1755741 + ... + 1845596.

Almost surely, 2^161800868736 is an apocalyptic number.

161800868736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161800868736 is an abundant number, since it is smaller than the sum of its proper divisors (352470197664).

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

161800868736 is a wasteful number, since it uses less digits than its factorization.

161800868736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601373 (or 3601355 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 161800868736 in words is "one hundred sixty-one billion, eight hundred million, eight hundred sixty-eight thousand, seven hundred thirty-six".