116561565509 has 8 divisors (see below), whose sum is σ = 123421138560. Its totient is φ = 109702326976.

The previous prime is 116561565493. The next prime is 116561565517. The reversal of 116561565509 is 905565165611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 116561565509 - 2⁴ = 116561565493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116561565529) 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 7 ways as a sum of consecutive naturals, for example, 1175732 + ... + 1271010.

It is an arithmetic number, because the mean of its divisors is an integer number (15427642320).

Almost surely, 2^116561565509 is an apocalyptic number.

It is an amenable number.

116561565509 is a deficient number, since it is larger than the sum of its proper divisors (6859573051).

116561565509 is an equidigital number, since it uses as much as digits as its factorization.

116561565509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167259.

The product of its (nonzero) digits is 1215000, while the sum is 50.

The spelling of 116561565509 in words is "one hundred sixteen billion, five hundred sixty-one million, five hundred sixty-five thousand, five hundred nine".