25450538553 has 24 divisors (see below), whose sum is σ = 41136627360. Its totient is φ = 15422902560.

The previous prime is 25450538459. The next prime is 25450538593. The reversal of 25450538553 is 35583505452.

25450538553 is a `hidden beast` number, since 2 + 5 + 45 + 0 + 53 + 8 + 553 = 666.

It is not a de Polignac number, because 25450538553 - 2¹⁰ = 25450537529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25450538499 and 25450538508.

It is not an unprimeable number, because it can be changed into a prime (25450538593) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2744701 + ... + 2753957.

It is an arithmetic number, because the mean of its divisors is an integer number (1714026140).

Almost surely, 2^25450538553 is an apocalyptic number.

It is an amenable number.

25450538553 is a deficient number, since it is larger than the sum of its proper divisors (15686088807).

25450538553 is an frugal number, since it uses more digits than its factorization.

25450538553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18534 (or 9271 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 45.

The spelling of 25450538553 in words is "twenty-five billion, four hundred fifty million, five hundred thirty-eight thousand, five hundred fifty-three".