117666805 has 4 divisors (see below), whose sum is σ = 141200172. Its totient is φ = 94133440.

The previous prime is 117666799. The next prime is 117666821. The reversal of 117666805 is 508666711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75585636 + 42081169 = 8694^2 + 6487^2 .

It is not a de Polignac number, because 117666805 - 2³ = 117666797 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 11766676 + ... + 11766685.

It is an arithmetic number, because the mean of its divisors is an integer number (35300043).

Almost surely, 2^117666805 is an apocalyptic number.

It is an amenable number.

117666805 is a deficient number, since it is larger than the sum of its proper divisors (23533367).

117666805 is an equidigital number, since it uses as much as digits as its factorization.

117666805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23533366.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 117666805 is about 10847.4331065004. The cubic root of 117666805 is about 490.0247176203.

The spelling of 117666805 in words is "one hundred seventeen million, six hundred sixty-six thousand, eight hundred five".