26666869 has 2 divisors, whose sum is σ = 26666870. Its totient is φ = 26666868.

The previous prime is 26666833. The next prime is 26666917. The reversal of 26666869 is 96866662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19580625 + 7086244 = 4425^2 + 2662^2 .

It is a cyclic number.

It is not a de Polignac number, because 26666869 - 2¹¹ = 26664821 is a prime.

It is a super-2 number, since 2×26666869² = 1422243804526322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26666669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13333434 + 13333435.

It is an arithmetic number, because the mean of its divisors is an integer number (13333435).

Almost surely, 2^26666869 is an apocalyptic number.

It is an amenable number.

26666869 is a deficient number, since it is larger than the sum of its proper divisors (1).

26666869 is an equidigital number, since it uses as much as digits as its factorization.

26666869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 49.

The square root of 26666869 is about 5163.9973857468. The cubic root of 26666869 is about 298.7610720499.

The spelling of 26666869 in words is "twenty-six million, six hundred sixty-six thousand, eight hundred sixty-nine".