25979657668 has 24 divisors (see below), whose sum is σ = 45898151040. Its totient is φ = 12866336160.

The previous prime is 25979657629. The next prime is 25979657677. The reversal of 25979657668 is 86675697952.

It is a super-2 number, since 2×25979657668² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25979657597 and 25979657606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185430 + ... + 293842.

It is an arithmetic number, because the mean of its divisors is an integer number (1912422960).

Almost surely, 2^25979657668 is an apocalyptic number.

It is an amenable number.

25979657668 is a deficient number, since it is larger than the sum of its proper divisors (19918493372).

25979657668 is a wasteful number, since it uses less digits than its factorization.

25979657668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108987 (or 108985 counting only the distinct ones).

The product of its digits is 342921600, while the sum is 70.

The spelling of 25979657668 in words is "twenty-five billion, nine hundred seventy-nine million, six hundred fifty-seven thousand, six hundred sixty-eight".