266640446 has 16 divisors (see below), whose sum is σ = 402732000. Its totient is φ = 132400128.

The previous prime is 266640443. The next prime is 266640467. The reversal of 266640446 is 644046662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266640443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235610 + ... + 236738.

It is an arithmetic number, because the mean of its divisors is an integer number (25170750).

Almost surely, 2^266640446 is an apocalyptic number.

266640446 is a deficient number, since it is larger than the sum of its proper divisors (136091554).

266640446 is a wasteful number, since it uses less digits than its factorization.

266640446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843.

The product of its (nonzero) digits is 165888, while the sum is 38.

The square root of 266640446 is about 16329.1287581426. The cubic root of 266640446 is about 643.6384925662.

The spelling of 266640446 in words is "two hundred sixty-six million, six hundred forty thousand, four hundred forty-six".