63505763507621 has 2 divisors, whose sum is σ = 63505763507622. Its totient is φ = 63505763507620.

The previous prime is 63505763507591. The next prime is 63505763507651. The reversal of 63505763507621 is 12670536750536.

It is a balanced prime because it is at equal distance from previous prime (63505763507591) and next prime (63505763507651).

It can be written as a sum of positive squares in only one way, i.e., 63442101153025 + 63662354596 = 7965055^2 + 252314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63505763507621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63505763507651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31752881753810 + 31752881753811.

It is an arithmetic number, because the mean of its divisors is an integer number (31752881753811).

Almost surely, 2^{63505763507621} is an apocalyptic number.

It is an amenable number.

63505763507621 is a deficient number, since it is larger than the sum of its proper divisors (1).

63505763507621 is an equidigital number, since it uses as much as digits as its factorization.

63505763507621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814000, while the sum is 56.

The spelling of 63505763507621 in words is "sixty-three trillion, five hundred five billion, seven hundred sixty-three million, five hundred seven thousand, six hundred twenty-one".