72165515517066 has 64 divisors (see below), whose sum is σ = 156163815319680. Its totient is φ = 22161258362880.

The previous prime is 72165515517001. The next prime is 72165515517083. The reversal of 72165515517066 is 66071551556127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 72165515516997 and 72165515517015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52166715 + ... + 53532206.

It is an arithmetic number, because the mean of its divisors is an integer number (2440059614370).

Almost surely, 2^{72165515517066} is an apocalyptic number.

72165515517066 is an abundant number, since it is smaller than the sum of its proper divisors (83998299802614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72165515517066 is a wasteful number, since it uses less digits than its factorization.

72165515517066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105699111.

The product of its (nonzero) digits is 13230000, while the sum is 57.

The spelling of 72165515517066 in words is "seventy-two trillion, one hundred sixty-five billion, five hundred fifteen million, five hundred seventeen thousand, sixty-six".