25155321256 has 64 divisors (see below), whose sum is σ = 52486963200. Its totient is φ = 11224051200.

The previous prime is 25155321241. The next prime is 25155321281. The reversal of 25155321256 is 65212355152.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3636441 + ... + 3643351.

It is an arithmetic number, because the mean of its divisors is an integer number (820108800).

Almost surely, 2^25155321256 is an apocalyptic number.

25155321256 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25155321256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26243481600).

25155321256 is an abundant number, since it is smaller than the sum of its proper divisors (27331641944).

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

25155321256 is a wasteful number, since it uses less digits than its factorization.

25155321256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8090 (or 8086 counting only the distinct ones).

The product of its digits is 90000, while the sum is 37.

The spelling of 25155321256 in words is "twenty-five billion, one hundred fifty-five million, three hundred twenty-one thousand, two hundred fifty-six".