161565615015 has 32 divisors (see below), whose sum is σ = 295503375360. Its totient is φ = 73841289984.

The previous prime is 161565615007. The next prime is 161565615017. The reversal of 161565615015 is 510516565161.

It is not a de Polignac number, because 161565615015 - 2³ = 161565615007 is a prime.

It is a super-2 number, since 2×161565615015² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161565615017) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276531 + ... + 632139.

It is an arithmetic number, because the mean of its divisors is an integer number (9234480480).

Almost surely, 2^161565615015 is an apocalyptic number.

161565615015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161565615015 is a deficient number, since it is larger than the sum of its proper divisors (133937760345).

161565615015 is a wasteful number, since it uses less digits than its factorization.

161565615015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359951.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 161565615015 in words is "one hundred sixty-one billion, five hundred sixty-five million, six hundred fifteen thousand, fifteen".