25555534431 has 24 divisors (see below), whose sum is σ = 39647947824. Its totient is φ = 14599186560.

The previous prime is 25555534373. The next prime is 25555534441. The reversal of 25555534431 is 13443555552.

It is not a de Polignac number, because 25555534431 - 2¹³ = 25555526239 is a prime.

It is a super-2 number, since 2×25555534431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25555534441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 568251 + ... + 611571.

It is an arithmetic number, because the mean of its divisors is an integer number (1651997826).

Almost surely, 2^25555534431 is an apocalyptic number.

25555534431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25555534431 is a deficient number, since it is larger than the sum of its proper divisors (14092413393).

25555534431 is a wasteful number, since it uses less digits than its factorization.

25555534431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47351 (or 47344 counting only the distinct ones).

The product of its digits is 900000, while the sum is 42.

The spelling of 25555534431 in words is "twenty-five billion, five hundred fifty-five million, five hundred thirty-four thousand, four hundred thirty-one".