161213566265 has 32 divisors (see below), whose sum is σ = 198009826560. Its totient is φ = 125976508416.

The previous prime is 161213566249. The next prime is 161213566271. The reversal of 161213566265 is 562665312161.

It is a cyclic number.

It is not a de Polignac number, because 161213566265 - 2⁴ = 161213566249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19842494 + ... + 19850616.

It is an arithmetic number, because the mean of its divisors is an integer number (6187807080).

Almost surely, 2^161213566265 is an apocalyptic number.

It is an amenable number.

161213566265 is a deficient number, since it is larger than the sum of its proper divisors (36796260295).

161213566265 is a wasteful number, since it uses less digits than its factorization.

161213566265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8753.

The product of its digits is 388800, while the sum is 44.

The spelling of 161213566265 in words is "one hundred sixty-one billion, two hundred thirteen million, five hundred sixty-six thousand, two hundred sixty-five".