266005649 has 32 divisors (see below), whose sum is σ = 346504704. Its totient is φ = 198443520.

The previous prime is 266005627. The next prime is 266005667. The reversal of 266005649 is 946500662.

It is a cyclic number.

It is not a de Polignac number, because 266005649 - 2¹² = 266001553 is a prime.

It is a super-2 number, since 2×266005649² = 141518010599822402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266005609) 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 31 ways as a sum of consecutive naturals, for example, 151919 + ... + 153659.

It is an arithmetic number, because the mean of its divisors is an integer number (10828272).

Almost surely, 2^266005649 is an apocalyptic number.

It is an amenable number.

266005649 is a deficient number, since it is larger than the sum of its proper divisors (80499055).

266005649 is a wasteful number, since it uses less digits than its factorization.

266005649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 266005649 is about 16309.6796105871. The cubic root of 266005649 is about 643.1273117379.

The spelling of 266005649 in words is "two hundred sixty-six million, five thousand, six hundred forty-nine".