161566510056051 has 16 divisors (see below), whose sum is σ = 217357197482880. Its totient is φ = 106746167420160.

The previous prime is 161566510056047. The next prime is 161566510056143. The reversal of 161566510056051 is 150650015665161.

It is not a de Polignac number, because 161566510056051 - 2² = 161566510056047 is a prime.

It is a super-2 number, since 2×161566510056051² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161566510056001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343859070 + ... + 344328611.

It is an arithmetic number, because the mean of its divisors is an integer number (13584824842680).

Almost surely, 2^{161566510056051} is an apocalyptic number.

161566510056051 is a deficient number, since it is larger than the sum of its proper divisors (55790687426829).

161566510056051 is a wasteful number, since it uses less digits than its factorization.

161566510056051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688188386.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 161566510056051 in words is "one hundred sixty-one trillion, five hundred sixty-six billion, five hundred ten million, fifty-six thousand, fifty-one".