266671680 has 112 divisors (see below), whose sum is σ = 923690304. Its totient is φ = 64645120.

The previous prime is 266671663. The next prime is 266671709. The reversal of 266671680 is 86176662.

It is a happy number.

It is a super-2 number, since 2×266671680² = 142227569828044800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2067 + ... + 23186.

Almost surely, 2^266671680 is an apocalyptic number.

266671680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266671680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461845152).

266671680 is an abundant number, since it is smaller than the sum of its proper divisors (657018624).

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

266671680 is a wasteful number, since it uses less digits than its factorization.

266671680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25284 (or 25274 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 266671680 is about 16330.0851191903. The cubic root of 266671680 is about 643.6636233119.

The spelling of 266671680 in words is "two hundred sixty-six million, six hundred seventy-one thousand, six hundred eighty".