25813657 has 2 divisors, whose sum is σ = 25813658. Its totient is φ = 25813656.

The previous prime is 25813591. The next prime is 25813663. The reversal of 25813657 is 75631852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14280841 + 11532816 = 3779^2 + 3396^2 .

It is a cyclic number.

It is not a de Polignac number, because 25813657 - 2¹⁵ = 25780889 is a prime.

It is not a weakly prime, because it can be changed into another prime (25813057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12906828 + 12906829.

It is an arithmetic number, because the mean of its divisors is an integer number (12906829).

Almost surely, 2^25813657 is an apocalyptic number.

It is an amenable number.

25813657 is a deficient number, since it is larger than the sum of its proper divisors (1).

25813657 is an equidigital number, since it uses as much as digits as its factorization.

25813657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 25813657 is about 5080.7142214456. The cubic root of 25813657 is about 295.5401651576.

The spelling of 25813657 in words is "twenty-five million, eight hundred thirteen thousand, six hundred fifty-seven".