25555819 has 2 divisors, whose sum is σ = 25555820. Its totient is φ = 25555818.

The previous prime is 25555801. The next prime is 25555841. The reversal of 25555819 is 91855552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25555819 - 2⁵ = 25555787 is a prime.

It is a super-2 number, since 2×25555819² = 1306199769521522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25555219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777909 + 12777910.

It is an arithmetic number, because the mean of its divisors is an integer number (12777910).

Almost surely, 2^25555819 is an apocalyptic number.

25555819 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555819 is an equidigital number, since it uses as much as digits as its factorization.

25555819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90000, while the sum is 40.

The square root of 25555819 is about 5055.2763524856. The cubic root of 25555819 is about 294.5528762251.

The spelling of 25555819 in words is "twenty-five million, five hundred fifty-five thousand, eight hundred nineteen".