266665730 has 32 divisors (see below), whose sum is σ = 497586240. Its totient is φ = 102773440.

The previous prime is 266665727. The next prime is 266665783. The reversal of 266665730 is 37566662.

It is a super-2 number, since 2×266665730² = 142221223112865800, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 274145 + ... + 275115.

It is an arithmetic number, because the mean of its divisors is an integer number (15549570).

Almost surely, 2^266665730 is an apocalyptic number.

266665730 is a deficient number, since it is larger than the sum of its proper divisors (230920510).

266665730 is a wasteful number, since it uses less digits than its factorization.

266665730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954.

The product of its (nonzero) digits is 272160, while the sum is 41.

The square root of 266665730 is about 16329.9029390869. The cubic root of 266665730 is about 643.6588361181.

The spelling of 266665730 in words is "two hundred sixty-six million, six hundred sixty-five thousand, seven hundred thirty".