116531621665 has 4 divisors (see below), whose sum is σ = 139837946004. Its totient is φ = 93225297328.

The previous prime is 116531621663. The next prime is 116531621677. The reversal of 116531621665 is 566126135611.

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 56503191616 + 60028430049 = 237704^2 + 245007^2 .

It is a cyclic number.

It is not a de Polignac number, because 116531621665 - 2¹ = 116531621663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116531621663) 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 3 ways as a sum of consecutive naturals, for example, 11653162162 + ... + 11653162171.

It is an arithmetic number, because the mean of its divisors is an integer number (34959486501).

Almost surely, 2^116531621665 is an apocalyptic number.

It is an amenable number.

116531621665 is a deficient number, since it is larger than the sum of its proper divisors (23306324339).

116531621665 is an equidigital number, since it uses as much as digits as its factorization.

116531621665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23306324338.

The product of its digits is 194400, while the sum is 43.

The spelling of 116531621665 in words is "one hundred sixteen billion, five hundred thirty-one million, six hundred twenty-one thousand, six hundred sixty-five".