25664843 has 2 divisors, whose sum is σ = 25664844. Its totient is φ = 25664842.

The previous prime is 25664783. The next prime is 25664887. The reversal of 25664843 is 34846652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25664843 - 2¹⁴ = 25648459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25664797 and 25664806.

It is not a weakly prime, because it can be changed into another prime (25664143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832421 + 12832422.

It is an arithmetic number, because the mean of its divisors is an integer number (12832422).

Almost surely, 2^25664843 is an apocalyptic number.

25664843 is a deficient number, since it is larger than the sum of its proper divisors (1).

25664843 is an equidigital number, since it uses as much as digits as its factorization.

25664843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 38.

The square root of 25664843 is about 5066.0480653069. The cubic root of 25664843 is about 294.9711472308.

The spelling of 25664843 in words is "twenty-five million, six hundred sixty-four thousand, eight hundred forty-three".