266810445981 has 6 divisors (see below), whose sum is σ = 385392866430. Its totient is φ = 177873630648.

The previous prime is 266810445959. The next prime is 266810445997. The reversal of 266810445981 is 189544018662.

266810445981 is a `hidden beast` number, since 2 + 6 + 6 + 8 + 1 + 0 + 44 + 598 + 1 = 666.

266810445981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 194605381881 + 72205064100 = 441141^2 + 268710^2 .

It is not a de Polignac number, because 266810445981 - 2⁶ = 266810445917 is a prime.

It is a super-2 number, since 2×266810445981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266810445281) 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 5 ways as a sum of consecutive naturals, for example, 14822802546 + ... + 14822802563.

It is an arithmetic number, because the mean of its divisors is an integer number (64232144405).

Almost surely, 2^266810445981 is an apocalyptic number.

It is an amenable number.

266810445981 is a deficient number, since it is larger than the sum of its proper divisors (118582420449).

266810445981 is a wasteful number, since it uses less digits than its factorization.

266810445981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29645605115 (or 29645605112 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 266810445981 in words is "two hundred sixty-six billion, eight hundred ten million, four hundred forty-five thousand, nine hundred eighty-one".