64566751720 has 32 divisors (see below), whose sum is σ = 145338316200. Its totient is φ = 25815478528.

The previous prime is 64566751681. The next prime is 64566751721. The reversal of 64566751720 is 2715766546.

64566751720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 63666391684 + 900360036 = 252322^2 + 30006^2 .

It is not an unprimeable number, because it can be changed into a prime (64566751721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257179 + ... + 441898.

Almost surely, 2^64566751720 is an apocalyptic number.

It is an amenable number.

64566751720 is an abundant number, since it is smaller than the sum of its proper divisors (80771564480).

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

64566751720 is a wasteful number, since it uses less digits than its factorization.

64566751720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701397 (or 701393 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 64566751720 in words is "sixty-four billion, five hundred sixty-six million, seven hundred fifty-one thousand, seven hundred twenty".