266505680 has 40 divisors (see below), whose sum is σ = 708145152. Its totient is φ = 91373184.

The previous prime is 266505661. The next prime is 266505691. The reversal of 266505680 is 86505662.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237392 + ... + 238511.

Almost surely, 2^266505680 is an apocalyptic number.

266505680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266505680 is an abundant number, since it is smaller than the sum of its proper divisors (441639472).

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

266505680 is a wasteful number, since it uses less digits than its factorization.

266505680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475923 (or 475917 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 266505680 is about 16325.0016845328. The cubic root of 266505680 is about 643.5300378987.

The spelling of 266505680 in words is "two hundred sixty-six million, five hundred five thousand, six hundred eighty".