25831361655 has 48 divisors (see below), whose sum is σ = 48885651360. Its totient is φ = 12513811200.

The previous prime is 25831361581. The next prime is 25831361711. The reversal of 25831361655 is 55616313852.

25831361655 is a `hidden beast` number, since 2 + 583 + 1 + 3 + 6 + 1 + 65 + 5 = 666.

It is not a de Polignac number, because 25831361655 - 2¹⁹ = 25830837367 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 25831361655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 587125 + ... + 629585.

It is an arithmetic number, because the mean of its divisors is an integer number (1018451070).

Almost surely, 2^25831361655 is an apocalyptic number.

25831361655 is a deficient number, since it is larger than the sum of its proper divisors (23054289705).

25831361655 is a wasteful number, since it uses less digits than its factorization.

25831361655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43712 (or 43709 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 25831361655 in words is "twenty-five billion, eight hundred thirty-one million, three hundred sixty-one thousand, six hundred fifty-five".