65720896128 has 160 divisors (see below), whose sum is σ = 196149307860. Its totient is φ = 21843689472.

The previous prime is 65720896123. The next prime is 65720896147. The reversal of 65720896128 is 82169802756.

65720896128 is a `hidden beast` number, since 6 + 572 + 0 + 8 + 9 + 61 + 2 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 58490455104 + 7230441024 = 241848^2 + 85032^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (65720896123) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3650926 + ... + 3668882.

Almost surely, 2^65720896128 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 65720896128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98074653930).

65720896128 is an abundant number, since it is smaller than the sum of its proper divisors (130428411732).

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

65720896128 is a wasteful number, since it uses less digits than its factorization.

65720896128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18336 (or 18315 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 65720896128 in words is "sixty-five billion, seven hundred twenty million, eight hundred ninety-six thousand, one hundred twenty-eight".