64630245655421 has 2 divisors, whose sum is σ = 64630245655422. Its totient is φ = 64630245655420.

The previous prime is 64630245655397. The next prime is 64630245655483. The reversal of 64630245655421 is 12455654203646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39106137180100 + 25524108475321 = 6253490^2 + 5052139^2 .

It is a cyclic number.

It is not a de Polignac number, because 64630245655421 - 2²² = 64630241461117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64630245655021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32315122827710 + 32315122827711.

It is an arithmetic number, because the mean of its divisors is an integer number (32315122827711).

Almost surely, 2^{64630245655421} is an apocalyptic number.

It is an amenable number.

64630245655421 is a deficient number, since it is larger than the sum of its proper divisors (1).

64630245655421 is an equidigital number, since it uses as much as digits as its factorization.

64630245655421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736000, while the sum is 53.

The spelling of 64630245655421 in words is "sixty-four trillion, six hundred thirty billion, two hundred forty-five million, six hundred fifty-five thousand, four hundred twenty-one".