117638661658 has 16 divisors (see below), whose sum is σ = 213528999744. Its totient is φ = 47450888640.

The previous prime is 117638661649. The next prime is 117638661697. The reversal of 117638661658 is 856166836711.

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, 247139808 + ... + 247140283.

It is an arithmetic number, because the mean of its divisors is an integer number (13345562484).

Almost surely, 2^117638661658 is an apocalyptic number.

117638661658 is a deficient number, since it is larger than the sum of its proper divisors (95890338086).

117638661658 is a wasteful number, since it uses less digits than its factorization.

117638661658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494280117.

The product of its digits is 8709120, while the sum is 58.

The spelling of 117638661658 in words is "one hundred seventeen billion, six hundred thirty-eight million, six hundred sixty-one thousand, six hundred fifty-eight".