25997429791 has 4 divisors (see below), whose sum is σ = 26184461800. Its totient is φ = 25810397784.

The previous prime is 25997429789. The next prime is 25997429803. The reversal of 25997429791 is 19792479952.

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 25997429791 - 2¹ = 25997429789 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 (25997429761) 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, 93515796 + ... + 93516073.

It is an arithmetic number, because the mean of its divisors is an integer number (6546115450).

Almost surely, 2^25997429791 is an apocalyptic number.

25997429791 is a deficient number, since it is larger than the sum of its proper divisors (187032009).

25997429791 is a wasteful number, since it uses less digits than its factorization.

25997429791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187032008.

The product of its digits is 25719120, while the sum is 64.

The spelling of 25997429791 in words is "twenty-five billion, nine hundred ninety-seven million, four hundred twenty-nine thousand, seven hundred ninety-one".