65767537640 has 64 divisors (see below), whose sum is σ = 169157203200. Its totient is φ = 22543446528.

The previous prime is 65767537559. The next prime is 65767537681. The reversal of 65767537640 is 4673576756.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1239332 + ... + 1291308.

It is an arithmetic number, because the mean of its divisors is an integer number (2643081300).

Almost surely, 2^65767537640 is an apocalyptic number.

It is an amenable number.

65767537640 is an abundant number, since it is smaller than the sum of its proper divisors (103389665560).

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

65767537640 is a wasteful number, since it uses less digits than its factorization.

65767537640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56514 (or 56510 counting only the distinct ones).

The product of its (nonzero) digits is 22226400, while the sum is 56.

The spelling of 65767537640 in words is "sixty-five billion, seven hundred sixty-seven million, five hundred thirty-seven thousand, six hundred forty".