161655765012 has 48 divisors (see below), whose sum is σ = 478980046720. Its totient is φ = 46187361216.

The previous prime is 161655764993. The next prime is 161655765023. The reversal of 161655765012 is 210567556161.

It is a happy number.

161655765012 is a `hidden beast` number, since 1 + 6 + 1 + 65 + 576 + 5 + 0 + 12 = 666.

It is a super-2 number, since 2×161655765012² (a number of 23 digits) contains 22 as substring.

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, 106914433 + ... + 106915944.

Almost surely, 2^161655765012 is an apocalyptic number.

161655765012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161655765012 is an abundant number, since it is smaller than the sum of its proper divisors (317324281708).

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

161655765012 is a wasteful number, since it uses less digits than its factorization.

161655765012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213830397 (or 213830389 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 161655765012 in words is "one hundred sixty-one billion, six hundred fifty-five million, seven hundred sixty-five thousand, twelve".