165311576666 has 16 divisors (see below), whose sum is σ = 249958072320. Its totient is φ = 81992418480.

The previous prime is 165311576641. The next prime is 165311576693. The reversal of 165311576666 is 666675113561.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1741676 + ... + 1834136.

It is an arithmetic number, because the mean of its divisors is an integer number (15622379520).

Almost surely, 2^165311576666 is an apocalyptic number.

165311576666 is a deficient number, since it is larger than the sum of its proper divisors (84646495654).

165311576666 is a wasteful number, since it uses less digits than its factorization.

165311576666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99629.

The product of its digits is 4082400, while the sum is 53.

The spelling of 165311576666 in words is "one hundred sixty-five billion, three hundred eleven million, five hundred seventy-six thousand, six hundred sixty-six".