266660180 has 24 divisors (see below), whose sum is σ = 560321160. Its totient is φ = 106600320.

The previous prime is 266660161. The next prime is 266660189. The reversal of 266660180 is 81066662.

It can be written as a sum of positive squares in 4 ways, for example, as 1817104 + 264843076 = 1348^2 + 16274^2 .

It is a super-2 number, since 2×266660180² = 142215303195264800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266660180.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266660189) 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, 44990 + ... + 50570.

It is an arithmetic number, because the mean of its divisors is an integer number (23346715).

Almost surely, 2^266660180 is an apocalyptic number.

266660180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266660180 is an abundant number, since it is smaller than the sum of its proper divisors (293660980).

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

266660180 is a wasteful number, since it uses less digits than its factorization.

266660180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7979 (or 7977 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 266660180 is about 16329.7330045534. The cubic root of 266660180 is about 643.6543706883.

The spelling of 266660180 in words is "two hundred sixty-six million, six hundred sixty thousand, one hundred eighty".