25128643495 has 4 divisors (see below), whose sum is σ = 30154372200. Its totient is φ = 20102914792.

The previous prime is 25128643453. The next prime is 25128643523. The reversal of 25128643495 is 59434682152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25128643495 is a prime.

It is a super-3 number, since 3×25128643495³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2512864345 + ... + 2512864354.

It is an arithmetic number, because the mean of its divisors is an integer number (7538593050).

Almost surely, 2^25128643495 is an apocalyptic number.

25128643495 is a deficient number, since it is larger than the sum of its proper divisors (5025728705).

25128643495 is an equidigital number, since it uses as much as digits as its factorization.

25128643495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5025728704.

The product of its digits is 2073600, while the sum is 49.

The spelling of 25128643495 in words is "twenty-five billion, one hundred twenty-eight million, six hundred forty-three thousand, four hundred ninety-five".