25291495089 has 27 divisors (see below), whose sum is σ = 42502206123. Its totient is φ = 14450374512.

The previous prime is 25291495087. The next prime is 25291495121. The reversal of 25291495089 is 98059419252.

The square root of 25291495089 is 159033.

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

25291495089 is a `hidden beast` number, since 2 + 5 + 2 + 91 + 49 + 508 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25238088225 + 53406864 = 158865^2 + 7308^2 .

It is not a de Polignac number, because 25291495089 - 2¹ = 25291495087 is a prime.

It is a super-2 number, since 2×25291495089² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25291495081) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3335907 + ... + 3343479.

Almost surely, 2^25291495089 is an apocalyptic number.

25291495089 is the 159033-rd square number.

25291495089 is the 79517-th centered octagonal number.

It is an amenable number.

25291495089 is a deficient number, since it is larger than the sum of its proper divisors (17210711034).

25291495089 is an frugal number, since it uses more digits than its factorization.

25291495089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15166 (or 7583 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 25291495089 in words is "twenty-five billion, two hundred ninety-one million, four hundred ninety-five thousand, eighty-nine".