161566051000000 has 98 divisors (see below), whose sum is σ = 400754413324724. Its totient is φ = 64626420000000.

The previous prime is 161566050999937. The next prime is 161566051000019. The reversal of 161566051000000 is 150665161.

It is a super-2 number, since 2×161566051000000² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 79783026 + ... + 81783025.

Almost surely, 2^{161566051000000} is an apocalyptic number.

161566051000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161566051000000 is an abundant number, since it is smaller than the sum of its proper divisors (239188362324724).

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

161566051000000 is an frugal number, since it uses more digits than its factorization.

161566051000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161566093 (or 161566058 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 161566051000000 in words is "one hundred sixty-one trillion, five hundred sixty-six billion, fifty-one million", and thus it is an aban number.