2566253656 has 16 divisors (see below), whose sum is σ = 4966943040. Its totient is φ = 1241735520.

The previous prime is 2566253647. The next prime is 2566253689. The reversal of 2566253656 is 6563526652.

It is a happy number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5173651 + ... + 5174146.

It is an arithmetic number, because the mean of its divisors is an integer number (310433940).

Almost surely, 2^2566253656 is an apocalyptic number.

It is an amenable number.

2566253656 is a deficient number, since it is larger than the sum of its proper divisors (2400689384).

2566253656 is a wasteful number, since it uses less digits than its factorization.

2566253656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10347834 (or 10347830 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 46.

The square root of 2566253656 is about 50658.2042318912. The cubic root of 2566253656 is about 1369.0937683384.

It can be divided in two parts, 256625 and 3656, that added together give a triangular number (260281 = T₇₂₁).

The spelling of 2566253656 in words is "two billion, five hundred sixty-six million, two hundred fifty-three thousand, six hundred fifty-six".