665164569646 has 16 divisors (see below), whose sum is σ = 1000663891200. Its totient is φ = 331610869240.

The previous prime is 665164569527. The next prime is 665164569661. The reversal of 665164569646 is 646965461566.

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, 1205505 + ... + 1668403.

It is an arithmetic number, because the mean of its divisors is an integer number (62541493200).

Almost surely, 2^665164569646 is an apocalyptic number.

665164569646 is a deficient number, since it is larger than the sum of its proper divisors (335499321554).

665164569646 is a wasteful number, since it uses less digits than its factorization.

665164569646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464999.

The product of its digits is 167961600, while the sum is 64.

The spelling of 665164569646 in words is "six hundred sixty-five billion, one hundred sixty-four million, five hundred sixty-nine thousand, six hundred forty-six".