266778212 has 36 divisors (see below), whose sum is σ = 501705540. Its totient is φ = 124084224.

The previous prime is 266778139. The next prime is 266778217. The reversal of 266778212 is 212877662.

It can be written as a sum of positive squares in 6 ways, for example, as 8726116 + 258052096 = 2954^2 + 16064^2 .

It is a super-2 number, since 2×266778212² = 142341228795833888, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266778212.

It is not an unprimeable number, because it can be changed into a prime (266778217) 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 11 ways as a sum of consecutive naturals, for example, 101588 + ... + 104180.

It is an arithmetic number, because the mean of its divisors is an integer number (13936265).

Almost surely, 2^266778212 is an apocalyptic number.

It is an amenable number.

266778212 is a deficient number, since it is larger than the sum of its proper divisors (234927328).

266778212 is a wasteful number, since it uses less digits than its factorization.

266778212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720 (or 2701 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 266778212 is about 16333.3466258449. The cubic root of 266778212 is about 643.7493237558.

The spelling of 266778212 in words is "two hundred sixty-six million, seven hundred seventy-eight thousand, two hundred twelve".