64507515732 has 36 divisors (see below), whose sum is σ = 177884362656. Its totient is φ = 19547731920.

The previous prime is 64507515719. The next prime is 64507515791. The reversal of 64507515732 is 23751570546.

It is a happy number.

64507515732 is a `hidden beast` number, since 6 + 4 + 5 + 0 + 75 + 1 + 573 + 2 = 666.

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

It is a super-2 number, since 2×64507515732² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81448488 + ... + 81449279.

It is an arithmetic number, because the mean of its divisors is an integer number (4941232296).

Almost surely, 2^64507515732 is an apocalyptic number.

It is an amenable number.

64507515732 is an abundant number, since it is smaller than the sum of its proper divisors (113376846924).

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

64507515732 is a wasteful number, since it uses less digits than its factorization.

64507515732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162897788 (or 162897783 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 45.

The spelling of 64507515732 in words is "sixty-four billion, five hundred seven million, five hundred fifteen thousand, seven hundred thirty-two".