25442880191 has 4 divisors (see below), whose sum is σ = 25462054752. Its totient is φ = 25423705632.

The previous prime is 25442880167. The next prime is 25442880193. The reversal of 25442880191 is 19108824452.

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-25442880191 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 (25442880193) 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, 9585290 + ... + 9587943.

It is an arithmetic number, because the mean of its divisors is an integer number (6365513688).

Almost surely, 2^25442880191 is an apocalyptic number.

25442880191 is a deficient number, since it is larger than the sum of its proper divisors (19174561).

25442880191 is a wasteful number, since it uses less digits than its factorization.

25442880191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19174560.

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 25442880191 in words is "twenty-five billion, four hundred forty-two million, eight hundred eighty thousand, one hundred ninety-one".