25555501405 has 32 divisors (see below), whose sum is σ = 35822246400. Its totient is φ = 17494646400.

The previous prime is 25555501397. The next prime is 25555501421. The reversal of 25555501405 is 50410555552.

It is not a de Polignac number, because 25555501405 - 2³ = 25555501397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1046080 + ... + 1070230.

It is an arithmetic number, because the mean of its divisors is an integer number (1119445200).

Almost surely, 2^25555501405 is an apocalyptic number.

It is an amenable number.

25555501405 is a deficient number, since it is larger than the sum of its proper divisors (10266744995).

25555501405 is an equidigital number, since it uses as much as digits as its factorization.

25555501405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24794 (or 24780 counting only the distinct ones).

The product of its (nonzero) digits is 125000, while the sum is 37.

The spelling of 25555501405 in words is "twenty-five billion, five hundred fifty-five million, five hundred one thousand, four hundred five".