25453649764 has 27 divisors (see below), whose sum is σ = 44865026073. Its totient is φ = 12635726400.

The previous prime is 25453649747. The next prime is 25453649791. The reversal of 25453649764 is 46794635452.

It is a happy number.

The square root of 25453649764 is 159542.

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., 19142936164 + 6310713600 = 138358^2 + 79440^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 76899079 + ... + 76899409.

Almost surely, 2^25453649764 is an apocalyptic number.

25453649764 is the 159542-nd square number.

It is an amenable number.

25453649764 is a deficient number, since it is larger than the sum of its proper divisors (19411376309).

25453649764 is an frugal number, since it uses more digits than its factorization.

25453649764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 574 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 55.

The spelling of 25453649764 in words is "twenty-five billion, four hundred fifty-three million, six hundred forty-nine thousand, seven hundred sixty-four".