25533617 has 2 divisors, whose sum is σ = 25533618. Its totient is φ = 25533616.

The previous prime is 25533559. The next prime is 25533619. The reversal of 25533617 is 71633552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 1366561 = 4916^2 + 1169^2 .

It is a cyclic number.

It is not a de Polignac number, because 25533617 - 2¹⁸ = 25271473 is a prime.

Together with 25533619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25533619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12766808 + 12766809.

It is an arithmetic number, because the mean of its divisors is an integer number (12766809).

Almost surely, 2^25533617 is an apocalyptic number.

It is an amenable number.

25533617 is a deficient number, since it is larger than the sum of its proper divisors (1).

25533617 is an equidigital number, since it uses as much as digits as its factorization.

25533617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 32.

The square root of 25533617 is about 5053.0799518709. The cubic root of 25533617 is about 294.4675524393.

The spelling of 25533617 in words is "twenty-five million, five hundred thirty-three thousand, six hundred seventeen".