63936669962521 has 2 divisors, whose sum is σ = 63936669962522. Its totient is φ = 63936669962520.

The previous prime is 63936669962509. The next prime is 63936669962533. The reversal of 63936669962521 is 12526996663936.

It is a balanced prime because it is at equal distance from previous prime (63936669962509) and next prime (63936669962533).

It can be written as a sum of positive squares in only one way, i.e., 61946344360000 + 1990325602521 = 7870600^2 + 1410789^2 .

It is a cyclic number.

It is not a de Polignac number, because 63936669962521 - 2¹³ = 63936669954329 is a prime.

It is not a weakly prime, because it can be changed into another prime (63936669962621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31968334981260 + 31968334981261.

It is an arithmetic number, because the mean of its divisors is an integer number (31968334981261).

Almost surely, 2^{63936669962521} is an apocalyptic number.

It is an amenable number.

63936669962521 is a deficient number, since it is larger than the sum of its proper divisors (1).

63936669962521 is an equidigital number, since it uses as much as digits as its factorization.

63936669962521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020366720, while the sum is 73.

The spelling of 63936669962521 in words is "sixty-three trillion, nine hundred thirty-six billion, six hundred sixty-nine million, nine hundred sixty-two thousand, five hundred twenty-one".