665061164 has 24 divisors (see below), whose sum is σ = 1204078176. Its totient is φ = 321200000.

The previous prime is 665061127. The next prime is 665061179. The reversal of 665061164 is 461160566.

It is a super-2 number, since 2×665061164² = 884612703722069792, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3512 + ... + 36639.

It is an arithmetic number, because the mean of its divisors is an integer number (50169924).

Almost surely, 2^665061164 is an apocalyptic number.

It is an amenable number.

665061164 is a deficient number, since it is larger than the sum of its proper divisors (539017012).

665061164 is a wasteful number, since it uses less digits than its factorization.

665061164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40297 (or 40295 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 665061164 is about 25788.7798082810. The cubic root of 665061164 is about 872.8786331553.

The spelling of 665061164 in words is "six hundred sixty-five million, sixty-one thousand, one hundred sixty-four".