25553663 has 2 divisors, whose sum is σ = 25553664. Its totient is φ = 25553662.

The previous prime is 25553659. The next prime is 25553711. The reversal of 25553663 is 36635552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25553663 - 2² = 25553659 is a prime.

It is a Sophie Germain prime.

It is equal to p_1598318 and since 25553663 and 1598318 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25553603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12776831 + 12776832.

It is an arithmetic number, because the mean of its divisors is an integer number (12776832).

Almost surely, 2^25553663 is an apocalyptic number.

25553663 is a deficient number, since it is larger than the sum of its proper divisors (1).

25553663 is an equidigital number, since it uses as much as digits as its factorization.

25553663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 35.

The square root of 25553663 is about 5055.0631054419. The cubic root of 25553663 is about 294.5445927384.

The spelling of 25553663 in words is "twenty-five million, five hundred fifty-three thousand, six hundred sixty-three".