25563145256 has 64 divisors (see below), whose sum is σ = 53331894720. Its totient is φ = 11389662720.

The previous prime is 25563145249. The next prime is 25563145339. The reversal of 25563145256 is 65254136552.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1034906 + ... + 1059318.

It is an arithmetic number, because the mean of its divisors is an integer number (833310855).

Almost surely, 2^25563145256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25563145256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26665947360).

25563145256 is an abundant number, since it is smaller than the sum of its proper divisors (27768749464).

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

25563145256 is a wasteful number, since it uses less digits than its factorization.

25563145256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24666 (or 24662 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 44.

The spelling of 25563145256 in words is "twenty-five billion, five hundred sixty-three million, one hundred forty-five thousand, two hundred fifty-six".