64566481520 has 40 divisors (see below), whose sum is σ = 150144277056. Its totient is φ = 25821911808.

The previous prime is 64566481501. The next prime is 64566481561. The reversal of 64566481520 is 2518466546.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389174 + ... + 529706.

Almost surely, 2^64566481520 is an apocalyptic number.

It is an amenable number.

64566481520 is an abundant number, since it is smaller than the sum of its proper divisors (85577795536).

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

64566481520 is a wasteful number, since it uses less digits than its factorization.

64566481520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146289 (or 146283 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 47.

The spelling of 64566481520 in words is "sixty-four billion, five hundred sixty-six million, four hundred eighty-one thousand, five hundred twenty".