266990917 has 4 divisors (see below), whose sum is σ = 267030540. Its totient is φ = 266951296.

The previous prime is 266990897. The next prime is 266990939. The reversal of 266990917 is 719099662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19589476 + 247401441 = 4426^2 + 15729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266990917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266990947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6898 + ... + 24115.

It is an arithmetic number, because the mean of its divisors is an integer number (66757635).

Almost surely, 2^266990917 is an apocalyptic number.

It is an amenable number.

266990917 is a deficient number, since it is larger than the sum of its proper divisors (39623).

266990917 is an equidigital number, since it uses as much as digits as its factorization.

266990917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39622.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 266990917 is about 16339.8567007180. The cubic root of 266990917 is about 643.9203676146.

The spelling of 266990917 in words is "two hundred sixty-six million, nine hundred ninety thousand, nine hundred seventeen".