25699991679 has 48 divisors (see below), whose sum is σ = 39801247200. Its totient is φ = 15931468800.

The previous prime is 25699991671. The next prime is 25699991687. The reversal of 25699991679 is 97619999652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25699991671) and next prime (25699991687).

It is not a de Polignac number, because 25699991679 - 2³ = 25699991671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25699991671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5432187 + ... + 5436915.

It is an arithmetic number, because the mean of its divisors is an integer number (829192650).

Almost surely, 2^25699991679 is an apocalyptic number.

25699991679 is a deficient number, since it is larger than the sum of its proper divisors (14101255521).

25699991679 is a wasteful number, since it uses less digits than its factorization.

25699991679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5336 (or 5333 counting only the distinct ones).

The product of its digits is 148803480, while the sum is 72.

The spelling of 25699991679 in words is "twenty-five billion, six hundred ninety-nine million, nine hundred ninety-one thousand, six hundred seventy-nine".