64521534572517 has 8 divisors (see below), whose sum is σ = 93849504832800. Its totient is φ = 39103960346960.

The previous prime is 64521534572513. The next prime is 64521534572533. The reversal of 64521534572517 is 71527543512546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64521534572517 - 2² = 64521534572513 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64521534572513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 977599008642 + ... + 977599008707.

It is an arithmetic number, because the mean of its divisors is an integer number (11731188104100).

Almost surely, 2^{64521534572517} is an apocalyptic number.

It is an amenable number.

64521534572517 is a deficient number, since it is larger than the sum of its proper divisors (29327970260283).

64521534572517 is a wasteful number, since it uses less digits than its factorization.

64521534572517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955198017363.

The product of its digits is 35280000, while the sum is 57.

The spelling of 64521534572517 in words is "sixty-four trillion, five hundred twenty-one billion, five hundred thirty-four million, five hundred seventy-two thousand, five hundred seventeen".