25976247991 has 16 divisors (see below), whose sum is σ = 26585798400. Its totient is φ = 25373214720.

The previous prime is 25976247977. The next prime is 25976248007. The reversal of 25976247991 is 19974267952.

It is a cyclic number.

It is not a de Polignac number, because 25976247991 - 2⁵ = 25976247959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25976247961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6105621 + ... + 6109873.

It is an arithmetic number, because the mean of its divisors is an integer number (1661612400).

Almost surely, 2^25976247991 is an apocalyptic number.

25976247991 is a deficient number, since it is larger than the sum of its proper divisors (609550409).

25976247991 is a wasteful number, since it uses less digits than its factorization.

25976247991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4986.

The product of its digits is 17146080, while the sum is 61.

The spelling of 25976247991 in words is "twenty-five billion, nine hundred seventy-six million, two hundred forty-seven thousand, nine hundred ninety-one".