2565566116161 has 16 divisors (see below), whose sum is σ = 3625021935360. Its totient is φ = 1611120855680.

The previous prime is 2565566116133. The next prime is 2565566116213. The reversal of 2565566116161 is 1616116655652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2565566116161 - 2⁶ = 2565566116097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2565566116361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359621625 + ... + 359628758.

It is an arithmetic number, because the mean of its divisors is an integer number (226563870960).

Almost surely, 2^{2565566116161} is an apocalyptic number.

It is an amenable number.

2565566116161 is a deficient number, since it is larger than the sum of its proper divisors (1059455819199).

2565566116161 is a wasteful number, since it uses less digits than its factorization.

2565566116161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719250456.

The product of its digits is 1944000, while the sum is 51.

The spelling of 2565566116161 in words is "two trillion, five hundred sixty-five billion, five hundred sixty-six million, one hundred sixteen thousand, one hundred sixty-one".