115661110065 has 16 divisors (see below), whose sum is σ = 185553918528. Its totient is φ = 61520544576.

The previous prime is 115661110043. The next prime is 115661110073. The reversal of 115661110065 is 560011166511.

It is not a de Polignac number, because 115661110065 - 2⁶ = 115661110001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10330519 + ... + 10341708.

It is an arithmetic number, because the mean of its divisors is an integer number (11597119908).

Almost surely, 2^115661110065 is an apocalyptic number.

115661110065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115661110065 is a deficient number, since it is larger than the sum of its proper divisors (69892808463).

115661110065 is a wasteful number, since it uses less digits than its factorization.

115661110065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20672608.

The product of its (nonzero) digits is 5400, while the sum is 33.

Adding to 115661110065 its reverse (560011166511), we get a palindrome (675672276576).

The spelling of 115661110065 in words is "one hundred fifteen billion, six hundred sixty-one million, one hundred ten thousand, sixty-five".