25566641 has 2 divisors, whose sum is σ = 25566642. Its totient is φ = 25566640.

The previous prime is 25566631. The next prime is 25566649. The reversal of 25566641 is 14666552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 5271616 = 4505^2 + 2296^2 .

It is a cyclic number.

It is not a de Polignac number, because 25566641 - 2⁶ = 25566577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25566649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12783320 + 12783321.

It is an arithmetic number, because the mean of its divisors is an integer number (12783321).

Almost surely, 2^25566641 is an apocalyptic number.

It is an amenable number.

25566641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25566641 is an equidigital number, since it uses as much as digits as its factorization.

25566641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 25566641 is about 5056.3466059992. The cubic root of 25566641 is about 294.5944479885.

The spelling of 25566641 in words is "twenty-five million, five hundred sixty-six thousand, six hundred forty-one".