266640243 has 8 divisors (see below), whose sum is σ = 374232000. Its totient is φ = 168404328.

The previous prime is 266640233. The next prime is 266640263. The reversal of 266640243 is 342046662.

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

It is not a de Polignac number, because 266640243 - 2⁸ = 266639987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266640203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2338893 + ... + 2339006.

It is an arithmetic number, because the mean of its divisors is an integer number (46779000).

Almost surely, 2^266640243 is an apocalyptic number.

266640243 is a deficient number, since it is larger than the sum of its proper divisors (107591757).

266640243 is a wasteful number, since it uses less digits than its factorization.

266640243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4677921.

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 266640243 is about 16329.1225422556. The cubic root of 266640243 is about 643.6383292268.

The spelling of 266640243 in words is "two hundred sixty-six million, six hundred forty thousand, two hundred forty-three".