25496197439 has 4 divisors (see below), whose sum is σ = 25520457480. Its totient is φ = 25471937400.

The previous prime is 25496197381. The next prime is 25496197469. The reversal of 25496197439 is 93479169452.

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-25496197439 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 (25496197469) 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, 12128444 + ... + 12130545.

It is an arithmetic number, because the mean of its divisors is an integer number (6380114370).

Almost surely, 2^25496197439 is an apocalyptic number.

25496197439 is a deficient number, since it is larger than the sum of its proper divisors (24260041).

25496197439 is a wasteful number, since it uses less digits than its factorization.

25496197439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24260040.

The product of its digits is 14696640, while the sum is 59.

The spelling of 25496197439 in words is "twenty-five billion, four hundred ninety-six million, one hundred ninety-seven thousand, four hundred thirty-nine".