64517136523 has 16 divisors (see below), whose sum is σ = 74349936640. Its totient is φ = 54838770336.

The previous prime is 64517136503. The next prime is 64517136529. The reversal of 64517136523 is 32563171546.

It is not a de Polignac number, because 64517136523 - 2⁵ = 64517136491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64517136523.

It is not an unprimeable number, because it can be changed into a prime (64517136529) 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, 1974265 + ... + 2006677.

It is an arithmetic number, because the mean of its divisors is an integer number (4646871040).

Almost surely, 2^64517136523 is an apocalyptic number.

64517136523 is a deficient number, since it is larger than the sum of its proper divisors (9832800117).

64517136523 is a wasteful number, since it uses less digits than its factorization.

64517136523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34786.

The product of its digits is 453600, while the sum is 43.

The spelling of 64517136523 in words is "sixty-four billion, five hundred seventeen million, one hundred thirty-six thousand, five hundred twenty-three".