266991841 has 2 divisors, whose sum is σ = 266991842. Its totient is φ = 266991840.

The previous prime is 266991799. The next prime is 266991847. The reversal of 266991841 is 148199662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222636241 + 44355600 = 14921^2 + 6660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266991841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 266991791 and 266991800.

It is not a weakly prime, because it can be changed into another prime (266991847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133495920 + 133495921.

It is an arithmetic number, because the mean of its divisors is an integer number (133495921).

Almost surely, 2^266991841 is an apocalyptic number.

It is an amenable number.

266991841 is a deficient number, since it is larger than the sum of its proper divisors (1).

266991841 is an equidigital number, since it uses as much as digits as its factorization.

266991841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 266991841 is about 16339.8849751153. The cubic root of 266991841 is about 643.9211104386.

The spelling of 266991841 in words is "two hundred sixty-six million, nine hundred ninety-one thousand, eight hundred forty-one".