25555993 has 2 divisors, whose sum is σ = 25555994. Its totient is φ = 25555992.

The previous prime is 25555979. The next prime is 25556021. The reversal of 25555993 is 39955552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17330569 + 8225424 = 4163^2 + 2868^2 .

It is a cyclic number.

It is not a de Polignac number, because 25555993 - 2⁵ = 25555961 is a prime.

It is not a weakly prime, because it can be changed into another prime (25555903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12777996 + 12777997.

It is an arithmetic number, because the mean of its divisors is an integer number (12777997).

Almost surely, 2^25555993 is an apocalyptic number.

It is an amenable number.

25555993 is a deficient number, since it is larger than the sum of its proper divisors (1).

25555993 is an equidigital number, since it uses as much as digits as its factorization.

25555993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 303750, while the sum is 43.

The square root of 25555993 is about 5055.2935621979. The cubic root of 25555993 is about 294.5535447237.

The spelling of 25555993 in words is "twenty-five million, five hundred fifty-five thousand, nine hundred ninety-three".