25919438591 has 4 divisors (see below), whose sum is σ = 25997745384. Its totient is φ = 25841131800.

The previous prime is 25919438581. The next prime is 25919438593. The reversal of 25919438591 is 19583491952.

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

It is a cyclic number.

It is not a de Polignac number, because 25919438591 - 2⁶ = 25919438527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25919438593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39152900 + ... + 39153561.

It is an arithmetic number, because the mean of its divisors is an integer number (6499436346).

Almost surely, 2^25919438591 is an apocalyptic number.

25919438591 is a deficient number, since it is larger than the sum of its proper divisors (78306793).

25919438591 is an equidigital number, since it uses as much as digits as its factorization.

25919438591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78306792.

The product of its digits is 3499200, while the sum is 56.

The spelling of 25919438591 in words is "twenty-five billion, nine hundred nineteen million, four hundred thirty-eight thousand, five hundred ninety-one".