25109254681 has 9 divisors (see below), whose sum is σ = 29210015199. Its totient is φ = 21521267544.

The previous prime is 25109254663. The next prime is 25109254717. The reversal of 25109254681 is 18645290152.

The square root of 25109254681 is 158459.

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

It can be written as a sum of positive squares in only one way, i.e., 6690422025 + 18418832656 = 81795^2 + 135716^2 .

It is not a de Polignac number, because 25109254681 - 2²⁹ = 24572383769 is a prime.

It is a super-2 number, since 2×25109254681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25109251681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1097895 + ... + 1120531.

Almost surely, 2^25109254681 is an apocalyptic number.

25109254681 is the 158459-th square number.

25109254681 is the 79230-th centered octagonal number.

It is an amenable number.

25109254681 is a deficient number, since it is larger than the sum of its proper divisors (4100760518).

25109254681 is an frugal number, since it uses more digits than its factorization.

25109254681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45288 (or 22644 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 25109254681 in words is "twenty-five billion, one hundred nine million, two hundred fifty-four thousand, six hundred eighty-one".