636080877161 has 2 divisors, whose sum is σ = 636080877162. Its totient is φ = 636080877160.

The previous prime is 636080877151. The next prime is 636080877169. The reversal of 636080877161 is 161778080636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 635279137936 + 801739225 = 797044^2 + 28315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636080877161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (636080877169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318040438580 + 318040438581.

It is an arithmetic number, because the mean of its divisors is an integer number (318040438581).

Almost surely, 2^636080877161 is an apocalyptic number.

It is an amenable number.

636080877161 is a deficient number, since it is larger than the sum of its proper divisors (1).

636080877161 is an equidigital number, since it uses as much as digits as its factorization.

636080877161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 636080877161 in words is "six hundred thirty-six billion, eighty million, eight hundred seventy-seven thousand, one hundred sixty-one".