25564667 has 2 divisors, whose sum is σ = 25564668. Its totient is φ = 25564666.

The previous prime is 25564619. The next prime is 25564681. The reversal of 25564667 is 76646552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25564667 - 2⁸ = 25564411 is a prime.

It is not a weakly prime, because it can be changed into another prime (25564697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782333 + 12782334.

It is an arithmetic number, because the mean of its divisors is an integer number (12782334).

Almost surely, 2^25564667 is an apocalyptic number.

25564667 is a deficient number, since it is larger than the sum of its proper divisors (1).

25564667 is an equidigital number, since it uses as much as digits as its factorization.

25564667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 41.

The square root of 25564667 is about 5056.1514020053. The cubic root of 25564667 is about 294.5868659156.

The spelling of 25564667 in words is "twenty-five million, five hundred sixty-four thousand, six hundred sixty-seven".