53622561521 has 2 divisors, whose sum is σ = 53622561522. Its totient is φ = 53622561520.

The previous prime is 53622561497. The next prime is 53622561523. The reversal of 53622561521 is 12516522635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52287682225 + 1334879296 = 228665^2 + 36536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53622561521 is a prime.

Together with 53622561523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (53622561523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26811280760 + 26811280761.

It is an arithmetic number, because the mean of its divisors is an integer number (26811280761).

Almost surely, 2^53622561521 is an apocalyptic number.

It is an amenable number.

53622561521 is a deficient number, since it is larger than the sum of its proper divisors (1).

53622561521 is an equidigital number, since it uses as much as digits as its factorization.

53622561521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 38.

The spelling of 53622561521 in words is "fifty-three billion, six hundred twenty-two million, five hundred sixty-one thousand, five hundred twenty-one".