25221862456 has 64 divisors (see below), whose sum is σ = 57275294400. Its totient is φ = 10164774912.

The previous prime is 25221862451. The next prime is 25221862469. The reversal of 25221862456 is 65426812252.

It is a happy number.

It is a super-2 number, since 2×25221862456² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221862451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1159230 + ... + 1180786.

It is an arithmetic number, because the mean of its divisors is an integer number (894926475).

Almost surely, 2^25221862456 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 25221862456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28637647200).

25221862456 is an abundant number, since it is smaller than the sum of its proper divisors (32053431944).

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

25221862456 is a wasteful number, since it uses less digits than its factorization.

25221862456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22816 (or 22812 counting only the distinct ones).

The product of its digits is 460800, while the sum is 43.

The spelling of 25221862456 in words is "twenty-five billion, two hundred twenty-one million, eight hundred sixty-two thousand, four hundred fifty-six".