266986660 has 24 divisors (see below), whose sum is σ = 561032640. Its totient is φ = 106725984.

The previous prime is 266986607. The next prime is 266986669. The reversal of 266986660 is 66689662.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (266986669) 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, 37507 + ... + 44053.

It is an arithmetic number, because the mean of its divisors is an integer number (23376360).

Almost surely, 2^266986660 is an apocalyptic number.

266986660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266986660 is an abundant number, since it is smaller than the sum of its proper divisors (294045980).

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

266986660 is a wasteful number, since it uses less digits than its factorization.

266986660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8595 (or 8593 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 266986660 is about 16339.7264358985. The cubic root of 266986660 is about 643.9169452965.

The spelling of 266986660 in words is "two hundred sixty-six million, nine hundred eighty-six thousand, six hundred sixty".