165515115566 has 8 divisors (see below), whose sum is σ = 248575078584. Its totient is φ = 82656756040.

The previous prime is 165515115547. The next prime is 165515115583. The reversal of 165515115566 is 665511515561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 165515115566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50398820 + ... + 50402103.

It is an arithmetic number, because the mean of its divisors is an integer number (31071884823).

Almost surely, 2^165515115566 is an apocalyptic number.

165515115566 is a deficient number, since it is larger than the sum of its proper divisors (83059963018).

165515115566 is a wasteful number, since it uses less digits than its factorization.

165515115566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100801746.

The product of its digits is 675000, while the sum is 47.

The spelling of 165515115566 in words is "one hundred sixty-five billion, five hundred fifteen million, one hundred fifteen thousand, five hundred sixty-six".