117155565 has 20 divisors (see below), whose sum is σ = 210012924. Its totient is φ = 62482752.

The previous prime is 117155531. The next prime is 117155569. The reversal of 117155565 is 565551711.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 80030916 + 37124649 = 8946^2 + 6093^2 .

It is not a de Polignac number, because 117155565 - 2¹² = 117151469 is a prime.

It is a super-3 number, since 3×117155565³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117155569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 144232 + ... + 145041.

Almost surely, 2^117155565 is an apocalyptic number.

117155565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

117155565 is a deficient number, since it is larger than the sum of its proper divisors (92857359).

117155565 is an equidigital number, since it uses as much as digits as its factorization.

117155565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289290 (or 289281 counting only the distinct ones).

The product of its digits is 26250, while the sum is 36.

The square root of 117155565 is about 10823.8424323343. The cubic root of 117155565 is about 489.3139990905.

The spelling of 117155565 in words is "one hundred seventeen million, one hundred fifty-five thousand, five hundred sixty-five".