266839906 has 4 divisors (see below), whose sum is σ = 400259862. Its totient is φ = 133419952.

The previous prime is 266839901. The next prime is 266839927. The reversal of 266839906 is 609938662.

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

It can be written as a sum of positive squares in only one way, i.e., 258084225 + 8755681 = 16065^2 + 2959^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 266839906.

It is not an unprimeable number, because it can be changed into a prime (266839901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66709975 + ... + 66709978.

Almost surely, 2^266839906 is an apocalyptic number.

266839906 is a deficient number, since it is larger than the sum of its proper divisors (133419956).

266839906 is a wasteful number, since it uses less digits than its factorization.

266839906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133419955.

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 266839906 is about 16335.2351069705. The cubic root of 266839906 is about 643.7989435123.

The spelling of 266839906 in words is "two hundred sixty-six million, eight hundred thirty-nine thousand, nine hundred six".