266622660 has 72 divisors (see below), whose sum is σ = 810089280. Its totient is φ = 70982208.

The previous prime is 266622659. The next prime is 266622667. The reversal of 266622660 is 66226662.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (266622667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201481 + ... + 202799.

It is an arithmetic number, because the mean of its divisors is an integer number (11251240).

Almost surely, 2^266622660 is an apocalyptic number.

266622660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266622660 is an abundant number, since it is smaller than the sum of its proper divisors (543466620).

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

266622660 is a wasteful number, since it uses less digits than its factorization.

266622660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457 (or 2452 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 266622660 is about 16328.5841394776. The cubic root of 266622660 is about 643.6241811480.

The spelling of 266622660 in words is "two hundred sixty-six million, six hundred twenty-two thousand, six hundred sixty".