266033781 has 32 divisors (see below), whose sum is σ = 425617920. Its totient is φ = 163259712.

The previous prime is 266033759. The next prime is 266033797. The reversal of 266033781 is 187330662.

It is a happy number.

It is not a de Polignac number, because 266033781 - 2⁶ = 266033717 is a prime.

It is a super-2 number, since 2×266033781² = 141547945266311922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266033711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161695 + ... + 163331.

It is an arithmetic number, because the mean of its divisors is an integer number (13300560).

Almost surely, 2^266033781 is an apocalyptic number.

It is an amenable number.

266033781 is a deficient number, since it is larger than the sum of its proper divisors (159584139).

266033781 is a wasteful number, since it uses less digits than its factorization.

266033781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122 (or 2116 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 266033781 is about 16310.5420204235. The cubic root of 266033781 is about 643.1499827098.

The spelling of 266033781 in words is "two hundred sixty-six million, thirty-three thousand, seven hundred eighty-one".