2565624043556 has 24 divisors (see below), whose sum is σ = 5131521084480. Its totient is φ = 1099494662112.

The previous prime is 2565624043531. The next prime is 2565624043583. The reversal of 2565624043556 is 6553404265652.

It is a junction number, because it is equal to n+sod(n) for n = 2565624043498 and 2565624043507.

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 7 ways as a sum of consecutive naturals, for example, 1899710 + ... + 2956373.

It is an arithmetic number, because the mean of its divisors is an integer number (213813378520).

Almost surely, 2^{2565624043556} is an apocalyptic number.

It is an amenable number.

2565624043556 is an abundant number, since it is smaller than the sum of its proper divisors (2565897040924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2565624043556 is a wasteful number, since it uses less digits than its factorization.

2565624043556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4874963 (or 4874961 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 53.

The spelling of 2565624043556 in words is "two trillion, five hundred sixty-five billion, six hundred twenty-four million, forty-three thousand, five hundred fifty-six".