25864981199 has 4 divisors (see below), whose sum is σ = 25975989936. Its totient is φ = 25753972464.

The previous prime is 25864981169. The next prime is 25864981229. The reversal of 25864981199 is 99118946852.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25864981169) and next prime (25864981229).

It is a cyclic number.

It is not a de Polignac number, because 25864981199 - 2¹⁶ = 25864915663 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 (25864981169) 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 3 ways as a sum of consecutive naturals, for example, 55504019 + ... + 55504484.

It is an arithmetic number, because the mean of its divisors is an integer number (6493997484).

Almost surely, 2^25864981199 is an apocalyptic number.

25864981199 is a deficient number, since it is larger than the sum of its proper divisors (111008737).

25864981199 is a wasteful number, since it uses less digits than its factorization.

25864981199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111008736.

The product of its digits is 11197440, while the sum is 62.

The spelling of 25864981199 in words is "twenty-five billion, eight hundred sixty-four million, nine hundred eighty-one thousand, one hundred ninety-nine".