117961665 has 16 divisors (see below), whose sum is σ = 194827776. Its totient is φ = 60883200.

The previous prime is 117961663. The next prime is 117961667. The reversal of 117961665 is 566169711.

It is an interprime number because it is at equal distance from previous prime (117961663) and next prime (117961667).

It is not a de Polignac number, because 117961665 - 2¹ = 117961663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117961663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126376 + ... + 127305.

It is an arithmetic number, because the mean of its divisors is an integer number (12176736).

Almost surely, 2^117961665 is an apocalyptic number.

117961665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

117961665 is a deficient number, since it is larger than the sum of its proper divisors (76866111).

117961665 is a wasteful number, since it uses less digits than its factorization.

117961665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253720.

The product of its digits is 68040, while the sum is 42.

The square root of 117961665 is about 10861.0158364676. The cubic root of 117961665 is about 490.4336921114.

The spelling of 117961665 in words is "one hundred seventeen million, nine hundred sixty-one thousand, six hundred sixty-five".