64577634521 has 2 divisors, whose sum is σ = 64577634522. Its totient is φ = 64577634520.

The previous prime is 64577634509. The next prime is 64577634557. The reversal of 64577634521 is 12543677546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61662822400 + 2914812121 = 248320^2 + 53989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64577634521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64577634521.

It is not a weakly prime, because it can be changed into another prime (64577634571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32288817260 + 32288817261.

It is an arithmetic number, because the mean of its divisors is an integer number (32288817261).

Almost surely, 2^64577634521 is an apocalyptic number.

It is an amenable number.

64577634521 is a deficient number, since it is larger than the sum of its proper divisors (1).

64577634521 is an equidigital number, since it uses as much as digits as its factorization.

64577634521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4233600, while the sum is 50.

The spelling of 64577634521 in words is "sixty-four billion, five hundred seventy-seven million, six hundred thirty-four thousand, five hundred twenty-one".