665515166 has 16 divisors (see below), whose sum is σ = 1096502400. Its totient is φ = 301537368.

The previous prime is 665515153. The next prime is 665515177. The reversal of 665515166 is 661515566.

It is a congruent 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, 379856 + ... + 381603.

It is an arithmetic number, because the mean of its divisors is an integer number (68531400).

Almost surely, 2^665515166 is an apocalyptic number.

665515166 is a deficient number, since it is larger than the sum of its proper divisors (430987234).

665515166 is a wasteful number, since it uses less digits than its factorization.

665515166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761503.

The product of its digits is 162000, while the sum is 41.

The square root of 665515166 is about 25797.5806229964. The cubic root of 665515166 is about 873.0772106325.

It can be divided in two parts, 66551 and 5166, that added together give a palindrome (71717).

The spelling of 665515166 in words is "six hundred sixty-five million, five hundred fifteen thousand, one hundred sixty-six".