25857761 has 2 divisors, whose sum is σ = 25857762. Its totient is φ = 25857760.

The previous prime is 25857707. The next prime is 25857781. The reversal of 25857761 is 16775852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13184161 + 12673600 = 3631^2 + 3560^2 .

It is a cyclic number.

It is not a de Polignac number, because 25857761 - 2¹⁰ = 25856737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25857701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12928880 + 12928881.

It is an arithmetic number, because the mean of its divisors is an integer number (12928881).

Almost surely, 2^25857761 is an apocalyptic number.

It is an amenable number.

25857761 is a deficient number, since it is larger than the sum of its proper divisors (1).

25857761 is an equidigital number, since it uses as much as digits as its factorization.

25857761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117600, while the sum is 41.

The square root of 25857761 is about 5085.0527037583. The cubic root of 25857761 is about 295.7083847309.

The spelling of 25857761 in words is "twenty-five million, eight hundred fifty-seven thousand, seven hundred sixty-one".