2565501556 has 24 divisors (see below), whose sum is σ = 4562734176. Its totient is φ = 1261914720.

The previous prime is 2565501553. The next prime is 2565501557. The reversal of 2565501556 is 6551055652.

2565501556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2565501556² = 13163596467676842272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565501551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207591 + ... + 219601.

It is an arithmetic number, because the mean of its divisors is an integer number (190113924).

Almost surely, 2^2565501556 is an apocalyptic number.

It is an amenable number.

2565501556 is a deficient number, since it is larger than the sum of its proper divisors (1997232620).

2565501556 is a wasteful number, since it uses less digits than its factorization.

2565501556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12879 (or 12877 counting only the distinct ones).

The product of its (nonzero) digits is 225000, while the sum is 40.

The square root of 2565501556 is about 50650.7804085979. The cubic root of 2565501556 is about 1368.9600070700.

The spelling of 2565501556 in words is "two billion, five hundred sixty-five million, five hundred one thousand, five hundred fifty-six".