266563720 has 16 divisors (see below), whose sum is σ = 599768460. Its totient is φ = 106625472.

The previous prime is 266563697. The next prime is 266563747. The reversal of 266563720 is 27365662.

266563720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 262245636 + 4318084 = 16194^2 + 2078^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 266563720.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3332007 + ... + 3332086.

Almost surely, 2^266563720 is an apocalyptic number.

266563720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266563720 is an abundant number, since it is smaller than the sum of its proper divisors (333204740).

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

266563720 is a wasteful number, since it uses less digits than its factorization.

266563720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664104 (or 6664100 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 266563720 is about 16326.7792292295. The cubic root of 266563720 is about 643.5767508146.

The spelling of 266563720 in words is "two hundred sixty-six million, five hundred sixty-three thousand, seven hundred twenty".