65712567021 has 16 divisors (see below), whose sum is σ = 92234688000. Its totient is φ = 41499738288.

The previous prime is 65712567001. The next prime is 65712567043. The reversal of 65712567021 is 12076521756.

It is a happy number.

It is not a de Polignac number, because 65712567021 - 2⁷ = 65712566893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65712567001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1005670 + ... + 1069016.

It is an arithmetic number, because the mean of its divisors is an integer number (5764668000).

Almost surely, 2^65712567021 is an apocalyptic number.

It is an amenable number.

65712567021 is a deficient number, since it is larger than the sum of its proper divisors (26522120979).

65712567021 is a wasteful number, since it uses less digits than its factorization.

65712567021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81568.

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 65712567021 in words is "sixty-five billion, seven hundred twelve million, five hundred sixty-seven thousand, twenty-one".