64212568665 has 32 divisors (see below), whose sum is σ = 119813548800. Its totient is φ = 29354314752.

The previous prime is 64212568661. The next prime is 64212568681. The reversal of 64212568665 is 56686521246.

It is not a de Polignac number, because 64212568665 - 2² = 64212568661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64212568661) 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, 6235144 + ... + 6245433.

It is an arithmetic number, because the mean of its divisors is an integer number (3744173400).

Almost surely, 2^64212568665 is an apocalyptic number.

It is an amenable number.

64212568665 is a deficient number, since it is larger than the sum of its proper divisors (55600980135).

64212568665 is a wasteful number, since it uses less digits than its factorization.

64212568665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12480606 (or 12480592 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 51.

The spelling of 64212568665 in words is "sixty-four billion, two hundred twelve million, five hundred sixty-eight thousand, six hundred sixty-five".