25940191679 has 4 divisors (see below), whose sum is σ = 25940522784. Its totient is φ = 25939860576.

The previous prime is 25940191661. The next prime is 25940191709. The reversal of 25940191679 is 97619104952.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25940191679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25940191679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25940191609) 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, 25319 + ... + 229175.

It is an arithmetic number, because the mean of its divisors is an integer number (6485130696).

Almost surely, 2^25940191679 is an apocalyptic number.

25940191679 is a deficient number, since it is larger than the sum of its proper divisors (331105).

25940191679 is a wasteful number, since it uses less digits than its factorization.

25940191679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331104.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The spelling of 25940191679 in words is "twenty-five billion, nine hundred forty million, one hundred ninety-one thousand, six hundred seventy-nine".