72117155165 has 32 divisors (see below), whose sum is σ = 95858380800. Its totient is φ = 51648736320.

The previous prime is 72117155153. The next prime is 72117155177. The reversal of 72117155165 is 56155171127.

It is an interprime number because it is at equal distance from previous prime (72117155153) and next prime (72117155177).

It is a de Polignac number, because none of the positive numbers 2^k-72117155165 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 978476 + ... + 1049594.

It is an arithmetic number, because the mean of its divisors is an integer number (2995574400).

Almost surely, 2^72117155165 is an apocalyptic number.

It is an amenable number.

72117155165 is a deficient number, since it is larger than the sum of its proper divisors (23741225635).

72117155165 is a wasteful number, since it uses less digits than its factorization.

72117155165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71417.

The product of its digits is 73500, while the sum is 41.

The spelling of 72117155165 in words is "seventy-two billion, one hundred seventeen million, one hundred fifty-five thousand, one hundred sixty-five".