266249986 has 8 divisors (see below), whose sum is σ = 413146620. Its totient is φ = 128534448.

The previous prime is 266249981. The next prime is 266249993. The reversal of 266249986 is 689942662.

It can be written as a sum of positive squares in 2 ways, for example, as 258212761 + 8037225 = 16069^2 + 2835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (266249981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2295201 + ... + 2295316.

Almost surely, 2^266249986 is an apocalyptic number.

266249986 is a deficient number, since it is larger than the sum of its proper divisors (146896634).

266249986 is a wasteful number, since it uses less digits than its factorization.

266249986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590548.

The product of its digits is 2239488, while the sum is 52.

The square root of 266249986 is about 16317.1684430847. The cubic root of 266249986 is about 643.3241643361.

The spelling of 266249986 in words is "two hundred sixty-six million, two hundred forty-nine thousand, nine hundred eighty-six".