117917889961 has 4 divisors (see below), whose sum is σ = 119085393924. Its totient is φ = 116750386000.

The previous prime is 117917889941. The next prime is 117917889979. The reversal of 117917889961 is 169988719711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169988719711 = 1553 ⋅109458287.

It can be written as a sum of positive squares in 2 ways, for example, as 48556766736 + 69361123225 = 220356^2 + 263365^2 .

It is a cyclic number.

It is not a de Polignac number, because 117917889961 - 2²⁵ = 117884335529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117917889911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 583751830 + ... + 583752031.

It is an arithmetic number, because the mean of its divisors is an integer number (29771348481).

Almost surely, 2^117917889961 is an apocalyptic number.

It is an amenable number.

117917889961 is a deficient number, since it is larger than the sum of its proper divisors (1167503963).

117917889961 is a wasteful number, since it uses less digits than its factorization.

117917889961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167503962.

The product of its digits is 13716864, while the sum is 67.

The spelling of 117917889961 in words is "one hundred seventeen billion, nine hundred seventeen million, eight hundred eighty-nine thousand, nine hundred sixty-one".