2566568638 has 4 divisors (see below), whose sum is σ = 3849852960. Its totient is φ = 1283284318.

The previous prime is 2566568633. The next prime is 2566568723. The reversal of 2566568638 is 8368656652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566568633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641642158 + ... + 641642161.

It is an arithmetic number, because the mean of its divisors is an integer number (962463240).

Almost surely, 2^2566568638 is an apocalyptic number.

2566568638 is a deficient number, since it is larger than the sum of its proper divisors (1283284322).

2566568638 is a wasteful number, since it uses less digits than its factorization.

2566568638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283284321.

The product of its digits is 12441600, while the sum is 55.

The square root of 2566568638 is about 50661.3130307536. The cubic root of 2566568638 is about 1369.1497802412.

The spelling of 2566568638 in words is "two billion, five hundred sixty-six million, five hundred sixty-eight thousand, six hundred thirty-eight".