63960091561 has 2 divisors, whose sum is σ = 63960091562. Its totient is φ = 63960091560.

The previous prime is 63960091541. The next prime is 63960091567. The reversal of 63960091561 is 16519006936.

63960091561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52960277161 + 10999814400 = 230131^2 + 104880^2 .

It is a cyclic number.

It is not a de Polignac number, because 63960091561 - 2²⁷ = 63825873833 is a prime.

It is not a weakly prime, because it can be changed into another prime (63960091567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31980045780 + 31980045781.

It is an arithmetic number, because the mean of its divisors is an integer number (31980045781).

Almost surely, 2^63960091561 is an apocalyptic number.

It is an amenable number.

63960091561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63960091561 is an equidigital number, since it uses as much as digits as its factorization.

63960091561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 46.

The spelling of 63960091561 in words is "sixty-three billion, nine hundred sixty million, ninety-one thousand, five hundred sixty-one".