25463441991 has 32 divisors (see below), whose sum is σ = 37133544448. Its totient is φ = 15425562240.

The previous prime is 25463441977. The next prime is 25463441999. The reversal of 25463441991 is 19914436452.

It is not a de Polignac number, because 25463441991 - 2⁷ = 25463441863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25463441991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25463441999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5973801 + ... + 5978061.

It is an arithmetic number, because the mean of its divisors is an integer number (1160423264).

Almost surely, 2^25463441991 is an apocalyptic number.

25463441991 is a deficient number, since it is larger than the sum of its proper divisors (11670102457).

25463441991 is a wasteful number, since it uses less digits than its factorization.

25463441991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6631.

The product of its digits is 933120, while the sum is 48.

The spelling of 25463441991 in words is "twenty-five billion, four hundred sixty-three million, four hundred forty-one thousand, nine hundred ninety-one".