25615559 has 2 divisors, whose sum is σ = 25615560. Its totient is φ = 25615558.

The previous prime is 25615523. The next prime is 25615561. The reversal of 25615559 is 95551652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25615559 - 2¹² = 25611463 is a prime.

It is a Sophie Germain prime.

Together with 25615561, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25615259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12807779 + 12807780.

It is an arithmetic number, because the mean of its divisors is an integer number (12807780).

Almost surely, 2^25615559 is an apocalyptic number.

25615559 is a deficient number, since it is larger than the sum of its proper divisors (1).

25615559 is an equidigital number, since it uses as much as digits as its factorization.

25615559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67500, while the sum is 38.

The square root of 25615559 is about 5061.1815814096. The cubic root of 25615559 is about 294.7822159720.

The spelling of 25615559 in words is "twenty-five million, six hundred fifteen thousand, five hundred fifty-nine".