65720578896 has 90 divisors (see below), whose sum is σ = 213955155882. Its totient is φ = 18777306240.

The previous prime is 65720578873. The next prime is 65720578943. The reversal of 65720578896 is 69887502756.

65720578896 is a `hidden beast` number, since 6 + 57 + 2 + 0 + 578 + 8 + 9 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 48768538896 + 16952040000 = 220836^2 + 130200^2 .

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4650015 + ... + 4664126.

Almost surely, 2^65720578896 is an apocalyptic number.

It is an amenable number.

65720578896 is an abundant number, since it is smaller than the sum of its proper divisors (148234576986).

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

65720578896 is a wasteful number, since it uses less digits than its factorization.

65720578896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9314169 (or 9314153 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 65720578896 in words is "sixty-five billion, seven hundred twenty million, five hundred seventy-eight thousand, eight hundred ninety-six".