266675656643 has 4 divisors (see below), whose sum is σ = 290918898168. Its totient is φ = 242432415120.

The previous prime is 266675656631. The next prime is 266675656759. The reversal of 266675656643 is 346656576662.

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

It is a cyclic number.

It is not a de Polignac number, because 266675656643 - 2²² = 266671462339 is a prime.

It is a super-2 number, since 2×266675656643² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266675656343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12121620746 + ... + 12121620767.

It is an arithmetic number, because the mean of its divisors is an integer number (72729724542).

Almost surely, 2^266675656643 is an apocalyptic number.

266675656643 is a deficient number, since it is larger than the sum of its proper divisors (24243241525).

266675656643 is a wasteful number, since it uses less digits than its factorization.

266675656643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24243241524.

The product of its digits is 195955200, while the sum is 62.

The spelling of 266675656643 in words is "two hundred sixty-six billion, six hundred seventy-five million, six hundred fifty-six thousand, six hundred forty-three".