64520634204 has 36 divisors (see below), whose sum is σ = 175639505496. Its totient is φ = 19852502688.

The previous prime is 64520634203. The next prime is 64520634223. The reversal of 64520634204 is 40243602546.

64520634204 is a `hidden beast` number, since 645 + 2 + 0 + 6 + 3 + 4 + 2 + 0 + 4 = 666.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520634203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68931834 + ... + 68932769.

Almost surely, 2^64520634204 is an apocalyptic number.

It is an amenable number.

64520634204 is an abundant number, since it is smaller than the sum of its proper divisors (111118871292).

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

64520634204 is a wasteful number, since it uses less digits than its factorization.

64520634204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137864626 (or 137864621 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The spelling of 64520634204 in words is "sixty-four billion, five hundred twenty million, six hundred thirty-four thousand, two hundred four".