664117764 has 12 divisors (see below), whose sum is σ = 1549608144. Its totient is φ = 221372584.

The previous prime is 664117759. The next prime is 664117771. The reversal of 664117764 is 467711466.

It is a tau number, because it is divible by the number of its divisors (12).

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, 27671562 + ... + 27671585.

It is an arithmetic number, because the mean of its divisors is an integer number (129134012).

Almost surely, 2^664117764 is an apocalyptic number.

It is an amenable number.

664117764 is an abundant number, since it is smaller than the sum of its proper divisors (885490380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664117764 is a wasteful number, since it uses less digits than its factorization.

664117764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55343154 (or 55343152 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 664117764 is about 25770.4824169048. The cubic root of 664117764 is about 872.4657070344.

The spelling of 664117764 in words is "six hundred sixty-four million, one hundred seventeen thousand, seven hundred sixty-four".