117811661 has 8 divisors (see below), whose sum is σ = 130440864. Its totient is φ = 105502320.

The previous prime is 117811651. The next prime is 117811667. The reversal of 117811661 is 166118711.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 117811661 - 2⁶ = 117811597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117811667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79190 + ... + 80663.

It is an arithmetic number, because the mean of its divisors is an integer number (16305108).

Almost surely, 2^117811661 is an apocalyptic number.

117811661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

117811661 is a deficient number, since it is larger than the sum of its proper divisors (12629203).

117811661 is a wasteful number, since it uses less digits than its factorization.

117811661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159931.

The product of its digits is 2016, while the sum is 32.

The square root of 117811661 is about 10854.1080241538. The cubic root of 117811661 is about 490.2257199677.

The spelling of 117811661 in words is "one hundred seventeen million, eight hundred eleven thousand, six hundred sixty-one".