25642957 has 2 divisors, whose sum is σ = 25642958. Its totient is φ = 25642956.

The previous prime is 25642949. The next prime is 25642973. The reversal of 25642957 is 75924652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 6405961 = 4386^2 + 2531^2 .

It is a cyclic number.

It is not a de Polignac number, because 25642957 - 2³ = 25642949 is a prime.

It is a super-2 number, since 2×25642957² = 1315122487407698, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25642927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821478 + 12821479.

It is an arithmetic number, because the mean of its divisors is an integer number (12821479).

Almost surely, 2^25642957 is an apocalyptic number.

It is an amenable number.

25642957 is a deficient number, since it is larger than the sum of its proper divisors (1).

25642957 is an equidigital number, since it uses as much as digits as its factorization.

25642957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 25642957 is about 5063.8875382457. The cubic root of 25642957 is about 294.8872766681.

The spelling of 25642957 in words is "twenty-five million, six hundred forty-two thousand, nine hundred fifty-seven".