213457065673 has 4 divisors (see below), whose sum is σ = 213459009300. Its totient is φ = 213455122048.

The previous prime is 213457065649. The next prime is 213457065721. The reversal of 213457065673 is 376560754312.

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 190142218809 + 23314846864 = 436053^2 + 152692^2 .

It is a cyclic number.

It is not a de Polignac number, because 213457065673 - 2⁵ = 213457065641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213457066673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796540 + ... + 1030237.

It is an arithmetic number, because the mean of its divisors is an integer number (53364752325).

Almost surely, 2^213457065673 is an apocalyptic number.

It is an amenable number.

213457065673 is a deficient number, since it is larger than the sum of its proper divisors (1943627).

213457065673 is a wasteful number, since it uses less digits than its factorization.

213457065673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943626.

The product of its (nonzero) digits is 3175200, while the sum is 49.

The spelling of 213457065673 in words is "two hundred thirteen billion, four hundred fifty-seven million, sixty-five thousand, six hundred seventy-three".