266097580 has 72 divisors (see below), whose sum is σ = 667793952. Its totient is φ = 87242496.

The previous prime is 266097547. The next prime is 266097589. The reversal of 266097580 is 85790662.

266097580 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (266097589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72264 + ... + 75856.

It is an arithmetic number, because the mean of its divisors is an integer number (9274916).

Almost surely, 2^266097580 is an apocalyptic number.

266097580 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 266097580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333896976).

266097580 is an abundant number, since it is smaller than the sum of its proper divisors (401696372).

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

266097580 is a wasteful number, since it uses less digits than its factorization.

266097580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3655 (or 3630 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 266097580 is about 16312.4976628351. The cubic root of 266097580 is about 643.2013910259.

The spelling of 266097580 in words is "two hundred sixty-six million, ninety-seven thousand, five hundred eighty".