25991453430 has 24 divisors (see below), whose sum is σ = 67577779152. Its totient is φ = 6931054224.

The previous prime is 25991453387. The next prime is 25991453437. The reversal of 25991453430 is 3435419952.

25991453430 is a `hidden beast` number, since 2 + 599 + 1 + 4 + 53 + 4 + 3 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25991453437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144396874 + ... + 144397053.

It is an arithmetic number, because the mean of its divisors is an integer number (2815740798).

Almost surely, 2^25991453430 is an apocalyptic number.

25991453430 is an abundant number, since it is smaller than the sum of its proper divisors (41586325722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25991453430 is a wasteful number, since it uses less digits than its factorization.

25991453430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288793940 (or 288793937 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 25991453430 in words is "twenty-five billion, nine hundred ninety-one million, four hundred fifty-three thousand, four hundred thirty".