2566905257 has 16 divisors (see below), whose sum is σ = 2955598464. Its totient is φ = 2183760000.

The previous prime is 2566905251. The next prime is 2566905311. The reversal of 2566905257 is 7525096652.

It is a cyclic number.

It is not a de Polignac number, because 2566905257 - 2¹⁰ = 2566904233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2566905251) 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, 759782 + ... + 763152.

It is an arithmetic number, because the mean of its divisors is an integer number (184724904).

Almost surely, 2^2566905257 is an apocalyptic number.

It is an amenable number.

2566905257 is a deficient number, since it is larger than the sum of its proper divisors (388693207).

2566905257 is a wasteful number, since it uses less digits than its factorization.

2566905257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4160.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The square root of 2566905257 is about 50664.6351708961. The cubic root of 2566905257 is about 1369.2096346937.

The spelling of 2566905257 in words is "two billion, five hundred sixty-six million, nine hundred five thousand, two hundred fifty-seven".