266041640 has 32 divisors (see below), whose sum is σ = 599697000. Its totient is φ = 106220544.

The previous prime is 266041639. The next prime is 266041673. The reversal of 266041640 is 46140662.

It can be written as a sum of positive squares in 4 ways, for example, as 242674084 + 23367556 = 15578^2 + 4834^2 .

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 7 ways as a sum of consecutive naturals, for example, 16916 + ... + 28604.

Almost surely, 2^266041640 is an apocalyptic number.

266041640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266041640 is an abundant number, since it is smaller than the sum of its proper divisors (333655360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266041640 is a wasteful number, since it uses less digits than its factorization.

266041640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12269 (or 12265 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 266041640 is about 16310.7829364504. The cubic root of 266041640 is about 643.1563158227.

The spelling of 266041640 in words is "two hundred sixty-six million, forty-one thousand, six hundred forty".