25804422491 has 8 divisors (see below), whose sum is σ = 25884414864. Its totient is φ = 25724469760.

The previous prime is 25804422467. The next prime is 25804422493. The reversal of 25804422491 is 19422440852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25804422491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25804422493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1786400 + ... + 1800786.

It is an arithmetic number, because the mean of its divisors is an integer number (3235551858).

Almost surely, 2^25804422491 is an apocalyptic number.

25804422491 is a deficient number, since it is larger than the sum of its proper divisors (79992373).

25804422491 is a wasteful number, since it uses less digits than its factorization.

25804422491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19821.

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 25804422491 in words is "twenty-five billion, eight hundred four million, four hundred twenty-two thousand, four hundred ninety-one".