213803666673 has 4 divisors (see below), whose sum is σ = 285071555568. Its totient is φ = 142535777780.

The previous prime is 213803666647. The next prime is 213803666677. The reversal of 213803666673 is 376666308312.

213803666673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213803666673 - 2²⁶ = 213736557809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213803666677) 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, 35633944443 + ... + 35633944448.

It is an arithmetic number, because the mean of its divisors is an integer number (71267888892).

Almost surely, 2^213803666673 is an apocalyptic number.

It is an amenable number.

213803666673 is a deficient number, since it is larger than the sum of its proper divisors (71267888895).

213803666673 is an equidigital number, since it uses as much as digits as its factorization.

213803666673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71267888894.

The product of its (nonzero) digits is 3919104, while the sum is 51.

The spelling of 213803666673 in words is "two hundred thirteen billion, eight hundred three million, six hundred sixty-six thousand, six hundred seventy-three".