266171000820643 has 4 divisors (see below), whose sum is σ = 266214400631248. Its totient is φ = 266127601010040.

The previous prime is 266171000820623. The next prime is 266171000820653. The reversal of 266171000820643 is 346028000171662.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266171000820643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266171000820593 and 266171000820602.

It is not an unprimeable number, because it can be changed into a prime (266171000820623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21699896103 + ... + 21699908368.

It is an arithmetic number, because the mean of its divisors is an integer number (66553600157812).

Almost surely, 2^{266171000820643} is an apocalyptic number.

266171000820643 is a deficient number, since it is larger than the sum of its proper divisors (43399810605).

266171000820643 is an equidigital number, since it uses as much as digits as its factorization.

266171000820643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43399810604.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 266171000820643 in words is "two hundred sixty-six trillion, one hundred seventy-one billion, eight hundred twenty thousand, six hundred forty-three".