25974157225 has 9 divisors (see below), whose sum is σ = 32208954213. Its totient is φ = 20778681120.

The previous prime is 25974157219. The next prime is 25974157243. The reversal of 25974157225 is 52275147952.

The square root of 25974157225 is 161165.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 270372249 + 25703784976 = 16443^2 + 160324^2 .

It is not a de Polignac number, because 25974157225 - 2⁵ = 25974157193 is a prime.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 789709 + ... + 821941.

Almost surely, 2^25974157225 is an apocalyptic number.

25974157225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25974157225 is the 161165-th square number.

25974157225 is the 80583-rd centered octagonal number.

It is an amenable number.

25974157225 is a deficient number, since it is larger than the sum of its proper divisors (6234796988).

25974157225 is an frugal number, since it uses more digits than its factorization.

25974157225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64476 (or 32238 counting only the distinct ones).

The product of its digits is 1764000, while the sum is 49.

Multiplying 25974157225 by its sum of digits (49), we get a square (1272733704025 = 1128155²).

The spelling of 25974157225 in words is "twenty-five billion, nine hundred seventy-four million, one hundred fifty-seven thousand, two hundred twenty-five".