25766813 has 2 divisors, whose sum is σ = 25766814. Its totient is φ = 25766812.

The previous prime is 25766809. The next prime is 25766879. The reversal of 25766813 is 31866752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22534009 + 3232804 = 4747^2 + 1798^2 .

It is a cyclic number.

It is not a de Polignac number, because 25766813 - 2² = 25766809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25762813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12883406 + 12883407.

It is an arithmetic number, because the mean of its divisors is an integer number (12883407).

Almost surely, 2^25766813 is an apocalyptic number.

It is an amenable number.

25766813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25766813 is an equidigital number, since it uses as much as digits as its factorization.

25766813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 25766813 is about 5076.1021463324. The cubic root of 25766813 is about 295.3612848288.

The spelling of 25766813 in words is "twenty-five million, seven hundred sixty-six thousand, eight hundred thirteen".