25697657 has 2 divisors, whose sum is σ = 25697658. Its totient is φ = 25697656.

The previous prime is 25697629. The next prime is 25697663. The reversal of 25697657 is 75679652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17147881 + 8549776 = 4141^2 + 2924^2 .

It is a cyclic number.

It is not a de Polignac number, because 25697657 - 2¹⁰ = 25696633 is a prime.

It is not a weakly prime, because it can be changed into another prime (25697677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12848828 + 12848829.

It is an arithmetic number, because the mean of its divisors is an integer number (12848829).

Almost surely, 2^25697657 is an apocalyptic number.

It is an amenable number.

25697657 is a deficient number, since it is larger than the sum of its proper divisors (1).

25697657 is an equidigital number, since it uses as much as digits as its factorization.

25697657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 47.

The square root of 25697657 is about 5069.2856498722. The cubic root of 25697657 is about 295.0968063022.

The spelling of 25697657 in words is "twenty-five million, six hundred ninety-seven thousand, six hundred fifty-seven".