636120284491 has 2 divisors, whose sum is σ = 636120284492. Its totient is φ = 636120284490.

The previous prime is 636120284461. The next prime is 636120284543. The reversal of 636120284491 is 194482021636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 636120284491 - 2³⁹ = 86364470603 is a prime.

It is not a weakly prime, because it can be changed into another prime (636120284431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318060142245 + 318060142246.

It is an arithmetic number, because the mean of its divisors is an integer number (318060142246).

Almost surely, 2^636120284491 is an apocalyptic number.

636120284491 is a deficient number, since it is larger than the sum of its proper divisors (1).

636120284491 is an equidigital number, since it uses as much as digits as its factorization.

636120284491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 636120284491 in words is "six hundred thirty-six billion, one hundred twenty million, two hundred eighty-four thousand, four hundred ninety-one".