25679646249 has 8 divisors (see below), whose sum is σ = 34273874880. Its totient is φ = 17102590896.

The previous prime is 25679646221. The next prime is 25679646271. The reversal of 25679646249 is 94264697652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25679646249 - 2⁵ = 25679646217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25679646192 and 25679646201.

It is not an unprimeable number, because it can be changed into a prime (25679646149) 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 7 ways as a sum of consecutive naturals, for example, 4289829 + ... + 4295810.

It is an arithmetic number, because the mean of its divisors is an integer number (4284234360).

Almost surely, 2^25679646249 is an apocalyptic number.

It is an amenable number.

25679646249 is a deficient number, since it is larger than the sum of its proper divisors (8594228631).

25679646249 is an equidigital number, since it uses as much as digits as its factorization.

25679646249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8586639.

The product of its digits is 39191040, while the sum is 60.

The spelling of 25679646249 in words is "twenty-five billion, six hundred seventy-nine million, six hundred forty-six thousand, two hundred forty-nine".