161505665115 has 32 divisors (see below), whose sum is σ = 267807762432. Its totient is φ = 83025600000.

The previous prime is 161505665093. The next prime is 161505665137. The reversal of 161505665115 is 511566505161.

It is an interprime number because it is at equal distance from previous prime (161505665093) and next prime (161505665137).

It is not a de Polignac number, because 161505665115 - 2⁷ = 161505664987 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 575166 + ... + 808595.

It is an arithmetic number, because the mean of its divisors is an integer number (8368992576).

Almost surely, 2^161505665115 is an apocalyptic number.

161505665115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161505665115 is a deficient number, since it is larger than the sum of its proper divisors (106302097317).

161505665115 is a wasteful number, since it uses less digits than its factorization.

161505665115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384051.

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

The spelling of 161505665115 in words is "one hundred sixty-one billion, five hundred five million, six hundred sixty-five thousand, one hundred fifteen".