25902649249 has 9 divisors (see below), whose sum is σ = 26054007987. Its totient is φ = 25752167544.

The previous prime is 25902649219. The next prime is 25902649271. The reversal of 25902649249 is 94294620952.

The square root of 25902649249 is 160943.

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., 3456616849 + 22446032400 = 58793^2 + 149820^2 .

It is not a de Polignac number, because 25902649249 - 2¹¹ = 25902647201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25902649196 and 25902649205.

It is not an unprimeable number, because it can be changed into a prime (25902649219) 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, 36533707 + ... + 36534415.

Almost surely, 2^25902649249 is an apocalyptic number.

25902649249 is the 160943-rd square number.

25902649249 is the 80472-nd centered octagonal number.

It is an amenable number.

25902649249 is a deficient number, since it is larger than the sum of its proper divisors (151358738).

25902649249 is an frugal number, since it uses more digits than its factorization.

25902649249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872 (or 936 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 25902649249 in words is "twenty-five billion, nine hundred two million, six hundred forty-nine thousand, two hundred forty-nine".