25668779 has 4 divisors (see below), whose sum is σ = 25812360. Its totient is φ = 25525200.

The previous prime is 25668767. The next prime is 25668781. The reversal of 25668779 is 97786652.

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

It is a cyclic number.

It is not a de Polignac number, because 25668779 - 2⁴ = 25668763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25668179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71522 + ... + 71879.

It is an arithmetic number, because the mean of its divisors is an integer number (6453090).

Almost surely, 2^25668779 is an apocalyptic number.

25668779 is a deficient number, since it is larger than the sum of its proper divisors (143581).

25668779 is a wasteful number, since it uses less digits than its factorization.

25668779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143580.

The product of its digits is 1270080, while the sum is 50.

The square root of 25668779 is about 5066.4365188957. The cubic root of 25668779 is about 294.9862255371.

The spelling of 25668779 in words is "twenty-five million, six hundred sixty-eight thousand, seven hundred seventy-nine".