161642500165 has 16 divisors (see below), whose sum is σ = 195628815360. Its totient is φ = 128210580160.

The previous prime is 161642500141. The next prime is 161642500207. The reversal of 161642500165 is 561005246161.

It is not a de Polignac number, because 161642500165 - 2⁹ = 161642499653 is a prime.

It is a super-2 number, since 2×161642500165² (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, 615132 + ... + 837658.

It is an arithmetic number, because the mean of its divisors is an integer number (12226800960).

Almost surely, 2^161642500165 is an apocalyptic number.

It is an amenable number.

161642500165 is a deficient number, since it is larger than the sum of its proper divisors (33986315195).

161642500165 is a wasteful number, since it uses less digits than its factorization.

161642500165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223772.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 161642500165 in words is "one hundred sixty-one billion, six hundred forty-two million, five hundred thousand, one hundred sixty-five".