25565851 has 2 divisors, whose sum is σ = 25565852. Its totient is φ = 25565850.

The previous prime is 25565833. The next prime is 25565899. The reversal of 25565851 is 15856552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25565851 - 2⁵ = 25565819 is a prime.

It is a super-2 number, since 2×25565851² = 1307225474708402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25565851.

It is not a weakly prime, because it can be changed into another prime (25565801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782925 + 12782926.

It is an arithmetic number, because the mean of its divisors is an integer number (12782926).

Almost surely, 2^25565851 is an apocalyptic number.

25565851 is a deficient number, since it is larger than the sum of its proper divisors (1).

25565851 is an equidigital number, since it uses as much as digits as its factorization.

25565851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60000, while the sum is 37.

The square root of 25565851 is about 5056.2684857511. The cubic root of 25565851 is about 294.5914136698.

The spelling of 25565851 in words is "twenty-five million, five hundred sixty-five thousand, eight hundred fifty-one".