266947888901 has 4 divisors (see below), whose sum is σ = 266949307404. Its totient is φ = 266946470400.

The previous prime is 266947888861. The next prime is 266947888927. The reversal of 266947888901 is 109888749662.

It is a happy number.

266947888901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 516670²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22912876900 + 244035012001 = 151370^2 + 493999^2 .

It is a cyclic number.

It is not a de Polignac number, because 266947888901 - 2³⁴ = 249768019717 is a prime.

It is a super-2 number, since 2×266947888901² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266947858901) 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 3 ways as a sum of consecutive naturals, for example, 374210 + ... + 820931.

It is an arithmetic number, because the mean of its divisors is an integer number (66737326851).

Almost surely, 2^266947888901 is an apocalyptic number.

It is an amenable number.

266947888901 is a deficient number, since it is larger than the sum of its proper divisors (1418503).

266947888901 is a wasteful number, since it uses less digits than its factorization.

266947888901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418502.

The product of its (nonzero) digits is 83607552, while the sum is 68.

The spelling of 266947888901 in words is "two hundred sixty-six billion, nine hundred forty-seven million, eight hundred eighty-eight thousand, nine hundred one".