266499816 has 64 divisors (see below), whose sum is σ = 730183680. Its totient is φ = 80383680.

The previous prime is 266499811. The next prime is 266499829. The reversal of 266499816 is 618994662.

It is not an unprimeable number, because it can be changed into a prime (266499811) 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 15 ways as a sum of consecutive naturals, for example, 57705 + ... + 62151.

It is an arithmetic number, because the mean of its divisors is an integer number (11409120).

Almost surely, 2^266499816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266499816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365091840).

266499816 is an abundant number, since it is smaller than the sum of its proper divisors (463683864).

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

266499816 is a wasteful number, since it uses less digits than its factorization.

266499816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694 (or 4690 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The square root of 266499816 is about 16324.8220817257. The cubic root of 266499816 is about 643.5253179395.

The spelling of 266499816 in words is "two hundred sixty-six million, four hundred ninety-nine thousand, eight hundred sixteen".