25660381 has 2 divisors, whose sum is σ = 25660382. Its totient is φ = 25660380.

The previous prime is 25660367. The next prime is 25660399. The reversal of 25660381 is 18306652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25341156 + 319225 = 5034^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 25660381 - 2⁹ = 25659869 is a prime.

It is a super-2 number, since 2×25660381² = 1316910306130322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25660781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12830190 + 12830191.

It is an arithmetic number, because the mean of its divisors is an integer number (12830191).

Almost surely, 2^25660381 is an apocalyptic number.

It is an amenable number.

25660381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25660381 is an equidigital number, since it uses as much as digits as its factorization.

25660381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 25660381 is about 5065.6076634497. The cubic root of 25660381 is about 294.9540520221.

The spelling of 25660381 in words is "twenty-five million, six hundred sixty thousand, three hundred eighty-one".