266642660 has 24 divisors (see below), whose sum is σ = 560285376. Its totient is φ = 106593120.

The previous prime is 266642633. The next prime is 266642669. The reversal of 266642660 is 66246662.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (266642669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44609 + ... + 50231.

It is an arithmetic number, because the mean of its divisors is an integer number (23345224).

Almost surely, 2^266642660 is an apocalyptic number.

266642660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266642660 is an abundant number, since it is smaller than the sum of its proper divisors (293642716).

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

266642660 is a wasteful number, since it uses less digits than its factorization.

266642660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8003 (or 8001 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 266642660 is about 16329.1965509636. The cubic root of 266642660 is about 643.6402740059.

The spelling of 266642660 in words is "two hundred sixty-six million, six hundred forty-two thousand, six hundred sixty".