266320643 has 8 divisors (see below), whose sum is σ = 267909120. Its totient is φ = 264737160.

The previous prime is 266320603. The next prime is 266320679. The reversal of 266320643 is 346023662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266320643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266320603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163688 + ... + 165306.

It is an arithmetic number, because the mean of its divisors is an integer number (33488640).

Almost surely, 2^266320643 is an apocalyptic number.

266320643 is a deficient number, since it is larger than the sum of its proper divisors (1588477).

266320643 is a wasteful number, since it uses less digits than its factorization.

266320643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 266320643 is about 16319.3334116317. Note that the first 3 decimals coincide. The cubic root of 266320643 is about 643.3810674190.

The spelling of 266320643 in words is "two hundred sixty-six million, three hundred twenty thousand, six hundred forty-three".