266216550 has 24 divisors (see below), whose sum is σ = 660217416. Its totient is φ = 70991040.

The previous prime is 266216539. The next prime is 266216557. The reversal of 266216550 is 55612662.

It is a happy number.

266216550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266216557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 887239 + ... + 887538.

It is an arithmetic number, because the mean of its divisors is an integer number (27509059).

Almost surely, 2^266216550 is an apocalyptic number.

266216550 is an abundant number, since it is smaller than the sum of its proper divisors (394000866).

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

266216550 is a wasteful number, since it uses less digits than its factorization.

266216550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774792 (or 1774787 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 266216550 is about 16316.1438458969. The cubic root of 266216550 is about 643.2972333960.

The spelling of 266216550 in words is "two hundred sixty-six million, two hundred sixteen thousand, five hundred fifty".