25659943 has 2 divisors, whose sum is σ = 25659944. Its totient is φ = 25659942.

The previous prime is 25659913. The next prime is 25659947. The reversal of 25659943 is 34995652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25659943 - 2¹⁷ = 25528871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25659943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25659947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12829971 + 12829972.

It is an arithmetic number, because the mean of its divisors is an integer number (12829972).

Almost surely, 2^25659943 is an apocalyptic number.

25659943 is a deficient number, since it is larger than the sum of its proper divisors (1).

25659943 is an equidigital number, since it uses as much as digits as its factorization.

25659943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 43.

The square root of 25659943 is about 5065.5644305447. The cubic root of 25659943 is about 294.9523738110.

The spelling of 25659943 in words is "twenty-five million, six hundred fifty-nine thousand, nine hundred forty-three".