25645457 has 2 divisors, whose sum is σ = 25645458. Its totient is φ = 25645456.

The previous prime is 25645447. The next prime is 25645493. The reversal of 25645457 is 75454652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20151121 + 5494336 = 4489^2 + 2344^2 .

It is a cyclic number.

It is not a de Polignac number, because 25645457 - 2⁸ = 25645201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25645457.

It is not a weakly prime, because it can be changed into another prime (25645427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822728 + 12822729.

It is an arithmetic number, because the mean of its divisors is an integer number (12822729).

Almost surely, 2^25645457 is an apocalyptic number.

It is an amenable number.

25645457 is a deficient number, since it is larger than the sum of its proper divisors (1).

25645457 is an equidigital number, since it uses as much as digits as its factorization.

25645457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168000, while the sum is 38.

The square root of 25645457 is about 5064.1343781539. The cubic root of 25645457 is about 294.8968594714.

The spelling of 25645457 in words is "twenty-five million, six hundred forty-five thousand, four hundred fifty-seven".