64057705520 has 80 divisors (see below), whose sum is σ = 151516364832. Its totient is φ = 25179617280.

The previous prime is 64057705493. The next prime is 64057705529. The reversal of 64057705520 is 2550775046.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (64057705529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5816339 + ... + 5827341.

Almost surely, 2^64057705520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64057705520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75758182416).

64057705520 is an abundant number, since it is smaller than the sum of its proper divisors (87458659312).

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

64057705520 is a wasteful number, since it uses less digits than its factorization.

64057705520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12270 (or 12264 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 41.

The spelling of 64057705520 in words is "sixty-four billion, fifty-seven million, seven hundred five thousand, five hundred twenty".