165615397101 has 24 divisors (see below), whose sum is σ = 298251105984. Its totient is φ = 86033972160.

The previous prime is 165615397099. The next prime is 165615397139. The reversal of 165615397101 is 101793516561.

165615397101 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 1 + 539 + 7 + 101 = 666.

It is not a de Polignac number, because 165615397101 - 2¹ = 165615397099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165615397141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119490936 + ... + 119492321.

It is an arithmetic number, because the mean of its divisors is an integer number (12427129416).

Almost surely, 2^165615397101 is an apocalyptic number.

165615397101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165615397101 is a deficient number, since it is larger than the sum of its proper divisors (132635708883).

165615397101 is a wasteful number, since it uses less digits than its factorization.

165615397101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238983281 (or 238983278 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 45.

The spelling of 165615397101 in words is "one hundred sixty-five billion, six hundred fifteen million, three hundred ninety-seven thousand, one hundred one".