2564543444 has 24 divisors (see below), whose sum is σ = 4509366120. Its totient is φ = 1276166144.

The previous prime is 2564543431. The next prime is 2564543477. The reversal of 2564543444 is 4443454652.

It can be written as a sum of positive squares in 4 ways, for example, as 26399044 + 2538144400 = 5138^2 + 50380^2 .

It is a super-2 number, since 2×2564543444² = 13153766152326762272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1650572 + ... + 1652124.

It is an arithmetic number, because the mean of its divisors is an integer number (187890255).

Almost surely, 2^2564543444 is an apocalyptic number.

It is an amenable number.

2564543444 is a deficient number, since it is larger than the sum of its proper divisors (1944822676).

2564543444 is a wasteful number, since it uses less digits than its factorization.

2564543444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259 (or 3257 counting only the distinct ones).

The product of its digits is 921600, while the sum is 41.

The square root of 2564543444 is about 50641.3215072435. The cubic root of 2564543444 is about 1368.7895686204.

The spelling of 2564543444 in words is "two billion, five hundred sixty-four million, five hundred forty-three thousand, four hundred forty-four".