213660747173 has 4 divisors (see below), whose sum is σ = 214168255308. Its totient is φ = 213153239040.

The previous prime is 213660747163. The next prime is 213660747187. The reversal of 213660747173 is 371747066312.

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 23549050849 + 190111696324 = 153457^2 + 436018^2 .

It is a cyclic number.

It is not a de Polignac number, because 213660747173 - 2⁸ = 213660746917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213660747163) 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, 253753436 + ... + 253754277.

It is an arithmetic number, because the mean of its divisors is an integer number (53542063827).

Almost surely, 2^213660747173 is an apocalyptic number.

It is an amenable number.

213660747173 is a deficient number, since it is larger than the sum of its proper divisors (507508135).

213660747173 is an equidigital number, since it uses as much as digits as its factorization.

213660747173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507508134.

The product of its (nonzero) digits is 889056, while the sum is 47.

The spelling of 213660747173 in words is "two hundred thirteen billion, six hundred sixty million, seven hundred forty-seven thousand, one hundred seventy-three".