161616116065 has 16 divisors (see below), whose sum is σ = 204375177216. Its totient is φ = 122446984000.

The previous prime is 161616116033. The next prime is 161616116083. The reversal of 161616116065 is 560611616161.

It is not a de Polignac number, because 161616116065 - 2⁵ = 161616116033 is a prime.

It is a super-2 number, since 2×161616116065² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

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, 6945601 + ... + 6968830.

It is an arithmetic number, because the mean of its divisors is an integer number (12773448576).

Almost surely, 2^161616116065 is an apocalyptic number.

It is an amenable number.

161616116065 is a deficient number, since it is larger than the sum of its proper divisors (42759061151).

161616116065 is a wasteful number, since it uses less digits than its factorization.

161616116065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13914560.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 161616116065 in words is "one hundred sixty-one billion, six hundred sixteen million, one hundred sixteen thousand, sixty-five".