25659643 has 2 divisors, whose sum is σ = 25659644. Its totient is φ = 25659642.

The previous prime is 25659637. The next prime is 25659649. The reversal of 25659643 is 34695652.

It is a balanced prime because it is at equal distance from previous prime (25659637) and next prime (25659649).

It is a cyclic number.

It is not a de Polignac number, because 25659643 - 2²¹ = 23562491 is a prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 25659596 and 25659605.

It is not a weakly prime, because it can be changed into another prime (25659649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12829821 + 12829822.

It is an arithmetic number, because the mean of its divisors is an integer number (12829822).

Almost surely, 2^25659643 is an apocalyptic number.

25659643 is a deficient number, since it is larger than the sum of its proper divisors (1).

25659643 is an equidigital number, since it uses as much as digits as its factorization.

25659643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 40.

The square root of 25659643 is about 5065.5348187531. The cubic root of 25659643 is about 294.9512243403.

The spelling of 25659643 in words is "twenty-five million, six hundred fifty-nine thousand, six hundred forty-three".