25139774225 has 12 divisors (see below), whose sum is σ = 31933646220. Its totient is φ = 19621286400.

The previous prime is 25139774201. The next prime is 25139774273. The reversal of 25139774225 is 52247793152.

It can be written as a sum of positive squares in 6 ways, for example, as 4158831121 + 20980943104 = 64489^2 + 144848^2 .

It is not a de Polignac number, because 25139774225 - 2¹⁶ = 25139708689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25139774225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12262280 + ... + 12264329.

It is an arithmetic number, because the mean of its divisors is an integer number (2661137185).

Almost surely, 2^25139774225 is an apocalyptic number.

25139774225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25139774225 is a deficient number, since it is larger than the sum of its proper divisors (6793871995).

25139774225 is a wasteful number, since it uses less digits than its factorization.

25139774225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24526660 (or 24526655 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 47.

The spelling of 25139774225 in words is "twenty-five billion, one hundred thirty-nine million, seven hundred seventy-four thousand, two hundred twenty-five".