2564423181 has 6 divisors (see below), whose sum is σ = 3704166830. Its totient is φ = 1709615448.

The previous prime is 2564423177. The next prime is 2564423189. The reversal of 2564423181 is 1813244652.

It is a happy number.

2564423181 is a `hidden beast` number, since 2 + 5 + 644 + 2 + 3 + 1 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2382416100 + 182007081 = 48810^2 + 13491^2 .

It is not a de Polignac number, because 2564423181 - 2² = 2564423177 is a prime.

It is a super-2 number, since 2×2564423181² = 13152532502500317522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564423189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142467946 + ... + 142467963.

Almost surely, 2^2564423181 is an apocalyptic number.

It is an amenable number.

2564423181 is a deficient number, since it is larger than the sum of its proper divisors (1139743649).

2564423181 is a wasteful number, since it uses less digits than its factorization.

2564423181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284935915 (or 284935912 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 2564423181 is about 50640.1340934244. The cubic root of 2564423181 is about 1368.7681720487.

The spelling of 2564423181 in words is "two billion, five hundred sixty-four million, four hundred twenty-three thousand, one hundred eighty-one".