2566785251 has 4 divisors (see below), whose sum is σ = 2567934912. Its totient is φ = 2565635592.

The previous prime is 2566785241. The next prime is 2566785253. The reversal of 2566785251 is 1525876652.

2566785251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2566785251 is a prime.

It is a super-2 number, since 2×2566785251² = 13176773049502266002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2566785196 and 2566785205.

It is not an unprimeable number, because it can be changed into a prime (2566785253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 571475 + ... + 575948.

It is an arithmetic number, because the mean of its divisors is an integer number (641983728).

Almost surely, 2^2566785251 is an apocalyptic number.

2566785251 is a deficient number, since it is larger than the sum of its proper divisors (1149661).

2566785251 is a wasteful number, since it uses less digits than its factorization.

2566785251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149660.

The product of its digits is 1008000, while the sum is 47.

The square root of 2566785251 is about 50663.4508398313. The cubic root of 2566785251 is about 1369.1882969458.

The spelling of 2566785251 in words is "two billion, five hundred sixty-six million, seven hundred eighty-five thousand, two hundred fifty-one".