25257779 has 2 divisors, whose sum is σ = 25257780. Its totient is φ = 25257778.

The previous prime is 25257769. The next prime is 25257797. The reversal of 25257779 is 97775252.

Together with next prime (25257797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25257779 - 2²⁰ = 24209203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25257709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12628889 + 12628890.

It is an arithmetic number, because the mean of its divisors is an integer number (12628890).

Almost surely, 2^25257779 is an apocalyptic number.

25257779 is a deficient number, since it is larger than the sum of its proper divisors (1).

25257779 is an equidigital number, since it uses as much as digits as its factorization.

25257779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 308700, while the sum is 44.

The square root of 25257779 is about 5025.7117903835. The cubic root of 25257779 is about 293.4033397247.

The spelling of 25257779 in words is "twenty-five million, two hundred fifty-seven thousand, seven hundred seventy-nine".