266543540 has 24 divisors (see below), whose sum is σ = 561577632. Its totient is φ = 106267680.

The previous prime is 266543531. The next prime is 266543569. The reversal of 266543540 is 45345662.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 266543540.

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, 15566 + ... + 27845.

It is an arithmetic number, because the mean of its divisors is an integer number (23399068).

Almost surely, 2^266543540 is an apocalyptic number.

266543540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266543540 is an abundant number, since it is smaller than the sum of its proper divisors (295034092).

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

266543540 is a wasteful number, since it uses less digits than its factorization.

266543540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43727 (or 43725 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 266543540 is about 16326.1612144435. The cubic root of 266543540 is about 643.5605099116.

The spelling of 266543540 in words is "two hundred sixty-six million, five hundred forty-three thousand, five hundred forty".