636111720874 has 16 divisors (see below), whose sum is σ = 1154622955968. Its totient is φ = 256582878912.

The previous prime is 636111720859. The next prime is 636111720877. The reversal of 636111720874 is 478027111636.

It is not an unprimeable number, because it can be changed into a prime (636111720877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1336368924 + ... + 1336369399.

It is an arithmetic number, because the mean of its divisors is an integer number (72163934748).

Almost surely, 2^636111720874 is an apocalyptic number.

636111720874 is a deficient number, since it is larger than the sum of its proper divisors (518511235094).

636111720874 is a wasteful number, since it uses less digits than its factorization.

636111720874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672738349.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 636111720874 in words is "six hundred thirty-six billion, one hundred eleven million, seven hundred twenty thousand, eight hundred seventy-four".