636958998668 has 12 divisors (see below), whose sum is σ = 1118045857992. Its totient is φ = 317517324960.

The previous prime is 636958998631. The next prime is 636958998671. The reversal of 636958998668 is 866899859636.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240542105 + ... + 240544752.

It is an arithmetic number, because the mean of its divisors is an integer number (93170488166).

Almost surely, 2^636958998668 is an apocalyptic number.

It is an amenable number.

636958998668 is a deficient number, since it is larger than the sum of its proper divisors (481086859324).

636958998668 is a wasteful number, since it uses less digits than its factorization.

636958998668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481087192 (or 481087190 counting only the distinct ones).

The product of its digits is 7255941120, while the sum is 83.

The spelling of 636958998668 in words is "six hundred thirty-six billion, nine hundred fifty-eight million, nine hundred ninety-eight thousand, six hundred sixty-eight".