641316564 has 36 divisors (see below), whose sum is σ = 1852693024. Its totient is φ = 183233232.

The previous prime is 641316539. The next prime is 641316593. The reversal of 641316564 is 465613146.

It is a happy number.

641316564 is a `hidden beast` number, since 64 + 1 + 31 + 6 + 564 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×641316564² = 822573870521532192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1272202 + ... + 1272705.

Almost surely, 2^641316564 is an apocalyptic number.

It is an amenable number.

641316564 is an abundant number, since it is smaller than the sum of its proper divisors (1211376460).

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

641316564 is a wasteful number, since it uses less digits than its factorization.

641316564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544924 (or 2544919 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 641316564 is about 25324.2287937856. The cubic root of 641316564 is about 862.3643985938.

The spelling of 641316564 in words is "six hundred forty-one million, three hundred sixteen thousand, five hundred sixty-four".