65720533979568 has 160 divisors (see below), whose sum is σ = 194875144192512. Its totient is φ = 18906149376000.

The previous prime is 65720533979567. The next prime is 65720533979603. The reversal of 65720533979568 is 86597933502756.

It is a self number, because there is not a number n which added to its sum of digits gives 65720533979568.

It is not an unprimeable number, because it can be changed into a prime (65720533979567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18912678 + ... + 22116293.

Almost surely, 2^{65720533979568} is an apocalyptic number.

65720533979568 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

65720533979568 is an abundant number, since it is smaller than the sum of its proper divisors (129154610212944).

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

65720533979568 is a wasteful number, since it uses less digits than its factorization.

65720533979568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41029163 (or 41029157 counting only the distinct ones).

The product of its (nonzero) digits is 2571912000, while the sum is 75.

The spelling of 65720533979568 in words is "sixty-five trillion, seven hundred twenty billion, five hundred thirty-three million, nine hundred seventy-nine thousand, five hundred sixty-eight".