25505523 has 28 divisors (see below), whose sum is σ = 38954520. Its totient is φ = 16687296.

The previous prime is 25505509. The next prime is 25505539. The reversal of 25505523 is 32550552.

It is not a de Polignac number, because 25505523 - 2¹⁰ = 25504499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (25505023) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 42715 + ... + 43307.

Almost surely, 2^25505523 is an apocalyptic number.

25505523 is a deficient number, since it is larger than the sum of its proper divisors (13448997).

25505523 is an frugal number, since it uses more digits than its factorization.

25505523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 27.

The square root of 25505523 is about 5050.2992980615. The cubic root of 25505523 is about 294.3595143787.

The spelling of 25505523 in words is "twenty-five million, five hundred five thousand, five hundred twenty-three".