64521534572518 has 16 divisors (see below), whose sum is σ = 96916687305984. Its totient is φ = 32215973292360.

The previous prime is 64521534572513. The next prime is 64521534572533. The reversal of 64521534572518 is 81527543512546.

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, 132668871 + ... + 133154317.

It is an arithmetic number, because the mean of its divisors is an integer number (6057292956624).

Almost surely, 2^{64521534572518} is an apocalyptic number.

64521534572518 is a deficient number, since it is larger than the sum of its proper divisors (32395152733466).

64521534572518 is a wasteful number, since it uses less digits than its factorization.

64521534572518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577587.

The product of its digits is 40320000, while the sum is 58.

The spelling of 64521534572518 in words is "sixty-four trillion, five hundred twenty-one billion, five hundred thirty-four million, five hundred seventy-two thousand, five hundred eighteen".