266199816 has 64 divisors (see below), whose sum is σ = 695721600. Its totient is φ = 84768768.

The previous prime is 266199797. The next prime is 266199833. The reversal of 266199816 is 618991662.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65541 + ... + 69483.

It is an arithmetic number, because the mean of its divisors is an integer number (10870650).

Almost surely, 2^266199816 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 266199816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347860800).

266199816 is an abundant number, since it is smaller than the sum of its proper divisors (429521784).

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

266199816 is a wasteful number, since it uses less digits than its factorization.

266199816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078 (or 4074 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 266199816 is about 16315.6310328470. The cubic root of 266199816 is about 643.2837541921.

The spelling of 266199816 in words is "two hundred sixty-six million, one hundred ninety-nine thousand, eight hundred sixteen".