25505491425 has 24 divisors (see below), whose sum is σ = 44649615456. Its totient is φ = 12802755840.

The previous prime is 25505491399. The next prime is 25505491463. The reversal of 25505491425 is 52419450552.

It is not a de Polignac number, because 25505491425 - 2⁵ = 25505491393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10000879 + ... + 10003428.

It is an arithmetic number, because the mean of its divisors is an integer number (1860400644).

Almost surely, 2^25505491425 is an apocalyptic number.

25505491425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25505491425 is a deficient number, since it is larger than the sum of its proper divisors (19144124031).

25505491425 is a wasteful number, since it uses less digits than its factorization.

25505491425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20004337 (or 20004332 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 42.

The spelling of 25505491425 in words is "twenty-five billion, five hundred five million, four hundred ninety-one thousand, four hundred twenty-five".