118117565 has 4 divisors (see below), whose sum is σ = 141741084. Its totient is φ = 94494048.

The previous prime is 118117553. The next prime is 118117567. The reversal of 118117565 is 565711811.

It is a happy number.

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 87403801 + 30713764 = 9349^2 + 5542^2 .

It is a cyclic number.

It is not a de Polignac number, because 118117565 - 2¹⁸ = 117855421 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 (118117567) 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, 11811752 + ... + 11811761.

It is an arithmetic number, because the mean of its divisors is an integer number (35435271).

Almost surely, 2^118117565 is an apocalyptic number.

It is an amenable number.

118117565 is a deficient number, since it is larger than the sum of its proper divisors (23623519).

118117565 is an equidigital number, since it uses as much as digits as its factorization.

118117565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23623518.

The product of its digits is 8400, while the sum is 35.

The square root of 118117565 is about 10868.1905117641. The cubic root of 118117565 is about 490.6496519724.

The spelling of 118117565 in words is "one hundred eighteen million, one hundred seventeen thousand, five hundred sixty-five".