636084671081 has 2 divisors, whose sum is σ = 636084671082. Its totient is φ = 636084671080.

The previous prime is 636084671009. The next prime is 636084671119. The reversal of 636084671081 is 180176480636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507063623056 + 129021048025 = 712084^2 + 359195^2 .

It is a cyclic number.

It is not a de Polignac number, because 636084671081 - 2²² = 636080476777 is a prime.

It is a super-2 number, since 2×636084671081² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (636084671281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318042335540 + 318042335541.

It is an arithmetic number, because the mean of its divisors is an integer number (318042335541).

Almost surely, 2^636084671081 is an apocalyptic number.

It is an amenable number.

636084671081 is a deficient number, since it is larger than the sum of its proper divisors (1).

636084671081 is an equidigital number, since it uses as much as digits as its factorization.

636084671081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 636084671081 in words is "six hundred thirty-six billion, eighty-four million, six hundred seventy-one thousand, eighty-one".