2561366593 has 4 divisors (see below), whose sum is σ = 2584033668. Its totient is φ = 2538699520.

The previous prime is 2561366579. The next prime is 2561366597. The reversal of 2561366593 is 3956631652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 215707969 + 2345658624 = 14687^2 + 48432^2 .

It is a cyclic number.

It is not a de Polignac number, because 2561366593 - 2²¹ = 2559269441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561366597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11333368 + ... + 11333593.

It is an arithmetic number, because the mean of its divisors is an integer number (646008417).

Almost surely, 2^2561366593 is an apocalyptic number.

It is an amenable number.

2561366593 is a deficient number, since it is larger than the sum of its proper divisors (22667075).

2561366593 is a wasteful number, since it uses less digits than its factorization.

2561366593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22667074.

The product of its digits is 874800, while the sum is 46.

The square root of 2561366593 is about 50609.9455937269. The cubic root of 2561366593 is about 1368.2241349935.

The spelling of 2561366593 in words is "two billion, five hundred sixty-one million, three hundred sixty-six thousand, five hundred ninety-three".