266640959 has 8 divisors (see below), whose sum is σ = 288408960. Its totient is φ = 245052576.

The previous prime is 266640949. The next prime is 266640961. The reversal of 266640959 is 959046662.

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

It is a cyclic number.

It is not a de Polignac number, because 266640959 - 2¹⁶ = 266575423 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 (266640929) 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, 41807 + ... + 47760.

It is an arithmetic number, because the mean of its divisors is an integer number (36051120).

Almost surely, 2^266640959 is an apocalyptic number.

266640959 is a deficient number, since it is larger than the sum of its proper divisors (21768001).

266640959 is a wasteful number, since it uses less digits than its factorization.

266640959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89809.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 266640959 is about 16329.1444662603. The cubic root of 266640959 is about 643.6389053397.

The spelling of 266640959 in words is "two hundred sixty-six million, six hundred forty thousand, nine hundred fifty-nine".