266870981 has 24 divisors (see below), whose sum is σ = 307599264. Its totient is φ = 230112000.

The previous prime is 266870957. The next prime is 266870993. The reversal of 266870981 is 189078662.

It is not a de Polignac number, because 266870981 - 2²⁶ = 199762117 is a prime.

It is a super-2 number, since 2×266870981² = 142440240999804722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266870911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 942866 + ... + 943148.

It is an arithmetic number, because the mean of its divisors is an integer number (12816636).

Almost surely, 2^266870981 is an apocalyptic number.

It is an amenable number.

266870981 is a deficient number, since it is larger than the sum of its proper divisors (40728283).

266870981 is a wasteful number, since it uses less digits than its factorization.

266870981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 266870981 is about 16336.1862440412. The cubic root of 266870981 is about 643.8239338719.

The spelling of 266870981 in words is "two hundred sixty-six million, eight hundred seventy thousand, nine hundred eighty-one".