25540621925 has 48 divisors (see below), whose sum is σ = 41271858432. Its totient is φ = 15215385600.

The previous prime is 25540621879. The next prime is 25540621927. The reversal of 25540621925 is 52912604552.

It is not a de Polignac number, because 25540621925 - 2²⁸ = 25272186469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25540621927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 291521 + ... + 368870.

It is an arithmetic number, because the mean of its divisors is an integer number (859830384).

Almost surely, 2^25540621925 is an apocalyptic number.

25540621925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25540621925 is a deficient number, since it is larger than the sum of its proper divisors (15731236507).

25540621925 is a wasteful number, since it uses less digits than its factorization.

25540621925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660438 (or 660433 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 25540621925 in words is "twenty-five billion, five hundred forty million, six hundred twenty-one thousand, nine hundred twenty-five".