25564619 has 2 divisors, whose sum is σ = 25564620. Its totient is φ = 25564618.

The previous prime is 25564597. The next prime is 25564667. The reversal of 25564619 is 91646552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25564619 - 2²⁰ = 24516043 is a prime.

It is a super-2 number, since 2×25564619² = 1307099489230322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1598960 and since 25564619 and 1598960 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (25564219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782309 + 12782310.

It is an arithmetic number, because the mean of its divisors is an integer number (12782310).

Almost surely, 2^25564619 is an apocalyptic number.

25564619 is a deficient number, since it is larger than the sum of its proper divisors (1).

25564619 is an equidigital number, since it uses as much as digits as its factorization.

25564619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 25564619 is about 5056.1466553098. The cubic root of 25564619 is about 294.5866815442.

The spelling of 25564619 in words is "twenty-five million, five hundred sixty-four thousand, six hundred nineteen".