25261525490 has 16 divisors (see below), whose sum is σ = 45472612248. Its totient is φ = 10104195456.

The previous prime is 25261525481. The next prime is 25261525493. The reversal of 25261525490 is 9452516252.

It can be written as a sum of positive squares in 4 ways, for example, as 19176433441 + 6085092049 = 138479^2 + 78007^2 .

It is not an unprimeable number, because it can be changed into a prime (25261525493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359054 + ... + 423606.

Almost surely, 2^25261525490 is an apocalyptic number.

25261525490 is a deficient number, since it is larger than the sum of its proper divisors (20211086758).

25261525490 is a wasteful number, since it uses less digits than its factorization.

25261525490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103693.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 25261525490 in words is "twenty-five billion, two hundred sixty-one million, five hundred twenty-five thousand, four hundred ninety".