64587745520 has 20 divisors (see below), whose sum is σ = 150166508520. Its totient is φ = 25835098176.

The previous prime is 64587745493. The next prime is 64587745549. The reversal of 64587745520 is 2554778546.

64587745520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 403673330 + ... + 403673489.

It is an arithmetic number, because the mean of its divisors is an integer number (7508325426).

Almost surely, 2^64587745520 is an apocalyptic number.

It is an amenable number.

64587745520 is an abundant number, since it is smaller than the sum of its proper divisors (85578763000).

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

64587745520 is a wasteful number, since it uses less digits than its factorization.

64587745520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807346832 (or 807346826 counting only the distinct ones).

The product of its (nonzero) digits is 9408000, while the sum is 53.

The spelling of 64587745520 in words is "sixty-four billion, five hundred eighty-seven million, seven hundred forty-five thousand, five hundred twenty".