25431243555 has 16 divisors (see below), whose sum is σ = 40987000224. Its totient is φ = 13464326400.

The previous prime is 25431243547. The next prime is 25431243569. The reversal of 25431243555 is 55534213452.

It is not a de Polignac number, because 25431243555 - 2³ = 25431243547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6185596 + ... + 6189705.

It is an arithmetic number, because the mean of its divisors is an integer number (2561687514).

Almost surely, 2^25431243555 is an apocalyptic number.

25431243555 is a deficient number, since it is larger than the sum of its proper divisors (15555756669).

25431243555 is a wasteful number, since it uses less digits than its factorization.

25431243555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12375446.

The product of its digits is 360000, while the sum is 39.

The spelling of 25431243555 in words is "twenty-five billion, four hundred thirty-one million, two hundred forty-three thousand, five hundred fifty-five".