266666417688 has 128 divisors (see below), whose sum is σ = 788835075840. Its totient is φ = 74199552000.

The previous prime is 266666417629. The next prime is 266666417701. The reversal of 266666417688 is 886714666662.

266666417688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×266666417688² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

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, 540598 + ... + 908613.

It is an arithmetic number, because the mean of its divisors is an integer number (6162774030).

Almost surely, 2^266666417688 is an apocalyptic number.

It is an amenable number.

266666417688 is an abundant number, since it is smaller than the sum of its proper divisors (522168658152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266666417688 is a wasteful number, since it uses less digits than its factorization.

266666417688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449289 (or 1449285 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 66.

The spelling of 266666417688 in words is "two hundred sixty-six billion, six hundred sixty-six million, four hundred seventeen thousand, six hundred eighty-eight".