64608255292921 has 2 divisors, whose sum is σ = 64608255292922. Its totient is φ = 64608255292920.

The previous prime is 64608255292909. The next prime is 64608255292951. The reversal of 64608255292921 is 12929255280646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36130449961321 + 28477805331600 = 6010861^2 + 5336460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64608255292921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64608255292921.

It is not a weakly prime, because it can be changed into another prime (64608255292951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32304127646460 + 32304127646461.

It is an arithmetic number, because the mean of its divisors is an integer number (32304127646461).

Almost surely, 2^{64608255292921} is an apocalyptic number.

It is an amenable number.

64608255292921 is a deficient number, since it is larger than the sum of its proper divisors (1).

64608255292921 is an equidigital number, since it uses as much as digits as its factorization.

64608255292921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 64608255292921 in words is "sixty-four trillion, six hundred eight billion, two hundred fifty-five million, two hundred ninety-two thousand, nine hundred twenty-one".