2566247651 has 16 divisors (see below), whose sum is σ = 2865300480. Its totient is φ = 2278554720.

The previous prime is 2566247623. The next prime is 2566247669. The reversal of 2566247651 is 1567426652.

It is a cyclic number.

It is not a de Polignac number, because 2566247651 - 2²⁶ = 2499138787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2566247681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120140 + ... + 139878.

It is an arithmetic number, because the mean of its divisors is an integer number (179081280).

Almost surely, 2^2566247651 is an apocalyptic number.

2566247651 is a deficient number, since it is larger than the sum of its proper divisors (299052829).

2566247651 is a wasteful number, since it uses less digits than its factorization.

2566247651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20026.

The product of its digits is 604800, while the sum is 44.

The square root of 2566247651 is about 50658.1449620888. The cubic root of 2566247651 is about 1369.0927004504.

The spelling of 2566247651 in words is "two billion, five hundred sixty-six million, two hundred forty-seven thousand, six hundred fifty-one".