25686663941 has 4 divisors (see below), whose sum is σ = 25687647084. Its totient is φ = 25685680800.

The previous prime is 25686663917. The next prime is 25686663943. The reversal of 25686663941 is 14936668652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4426107841 + 21260556100 = 66529^2 + 145810^2 .

It is a cyclic number.

It is not a de Polignac number, because 25686663941 - 2¹⁰ = 25686662917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25686663943) 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, 451280 + ... + 505001.

It is an arithmetic number, because the mean of its divisors is an integer number (6421911771).

Almost surely, 2^25686663941 is an apocalyptic number.

It is an amenable number.

25686663941 is a deficient number, since it is larger than the sum of its proper divisors (983143).

25686663941 is an equidigital number, since it uses as much as digits as its factorization.

25686663941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983142.

The product of its digits is 11197440, while the sum is 56.

The spelling of 25686663941 in words is "twenty-five billion, six hundred eighty-six million, six hundred sixty-three thousand, nine hundred forty-one".