2566430538 has 24 divisors (see below), whose sum is σ = 5866877472. Its totient is φ = 733172064.

The previous prime is 2566430521. The next prime is 2566430561. The reversal of 2566430538 is 8350346652.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 2566430538.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 324406 + ... + 332222.

It is an arithmetic number, because the mean of its divisors is an integer number (244453228).

Almost surely, 2^2566430538 is an apocalyptic number.

2566430538 is an abundant number, since it is smaller than the sum of its proper divisors (3300446934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2566430538 is an frugal number, since it uses more digits than its factorization.

2566430538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15646 (or 7829 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The square root of 2566430538 is about 50659.9500394542. The cubic root of 2566430538 is about 1369.1252230726.

Multiplying 2566430538 by its sum of digits (42), we get a square (107790082596 = 328314²).

2566430538 divided by its sum of digits (42) gives a square (61105489 = 7817²).

The spelling of 2566430538 in words is "two billion, five hundred sixty-six million, four hundred thirty thousand, five hundred thirty-eight".