2565788161 has 16 divisors (see below), whose sum is σ = 2727825408. Its totient is φ = 2408155200.

The previous prime is 2565788111. The next prime is 2565788179. The reversal of 2565788161 is 1618875652.

It is not a de Polignac number, because 2565788161 - 2⁷ = 2565788033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2565788111) 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, 644800 + ... + 648766.

It is an arithmetic number, because the mean of its divisors is an integer number (170489088).

Almost surely, 2^2565788161 is an apocalyptic number.

It is an amenable number.

2565788161 is a deficient number, since it is larger than the sum of its proper divisors (162037247).

2565788161 is a wasteful number, since it uses less digits than its factorization.

2565788161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4512.

The product of its digits is 806400, while the sum is 49.

The square root of 2565788161 is about 50653.6095554897. The cubic root of 2565788161 is about 1369.0109829598.

The spelling of 2565788161 in words is "two billion, five hundred sixty-five million, seven hundred eighty-eight thousand, one hundred sixty-one".