266066440 has 16 divisors (see below), whose sum is σ = 598649580. Its totient is φ = 106426560.

The previous prime is 266066431. The next prime is 266066453. The reversal of 266066440 is 44660662.

It can be written as a sum of positive squares in 2 ways, for example, as 260693316 + 5373124 = 16146^2 + 2318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 266066396 and 266066405.

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, 3325791 + ... + 3325870.

Almost surely, 2^266066440 is an apocalyptic number.

266066440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266066440 is an abundant number, since it is smaller than the sum of its proper divisors (332583140).

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

266066440 is a wasteful number, since it uses less digits than its factorization.

266066440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6651672 (or 6651668 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 266066440 is about 16311.5431520135. The cubic root of 266066440 is about 643.1762998887.

The spelling of 266066440 in words is "two hundred sixty-six million, sixty-six thousand, four hundred forty".