64520661252 has 48 divisors (see below), whose sum is σ = 156120652800. Its totient is φ = 20714453760.

The previous prime is 64520661229. The next prime is 64520661277. The reversal of 64520661252 is 25216602546.

It is a self number, because there is not a number n which added to its sum of digits gives 64520661252.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84324 + ... + 368987.

It is an arithmetic number, because the mean of its divisors is an integer number (3252513600).

Almost surely, 2^64520661252 is an apocalyptic number.

It is an amenable number.

64520661252 is an abundant number, since it is smaller than the sum of its proper divisors (91599991548).

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

64520661252 is a wasteful number, since it uses less digits than its factorization.

64520661252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453756 (or 453754 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 64520661252 in words is "sixty-four billion, five hundred twenty million, six hundred sixty-one thousand, two hundred fifty-two".