636666794 has 16 divisors (see below), whose sum is σ = 980453376. Its totient is φ = 309920400.

The previous prime is 636666787. The next prime is 636666857. The reversal of 636666794 is 497666636.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224 + ... + 35684.

It is an arithmetic number, because the mean of its divisors is an integer number (61278336).

Almost surely, 2^636666794 is an apocalyptic number.

636666794 is a deficient number, since it is larger than the sum of its proper divisors (343786582).

636666794 is a wasteful number, since it uses less digits than its factorization.

636666794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35701.

The product of its digits is 5878656, while the sum is 53.

The square root of 636666794 is about 25232.2570135927. The cubic root of 636666794 is about 860.2751931641.

The spelling of 636666794 in words is "six hundred thirty-six million, six hundred sixty-six thousand, seven hundred ninety-four".