213561323166 has 16 divisors (see below), whose sum is σ = 427436492688. Its totient is φ = 71134800000.

The previous prime is 213561323149. The next prime is 213561323191. The reversal of 213561323166 is 661323165312.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13068085 + ... + 13084416.

It is an arithmetic number, because the mean of its divisors is an integer number (26714780793).

Almost surely, 2^213561323166 is an apocalyptic number.

213561323166 is an abundant number, since it is smaller than the sum of its proper divisors (213875169522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213561323166 is a wasteful number, since it uses less digits than its factorization.

213561323166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26153867.

The product of its digits is 116640, while the sum is 39.

Adding to 213561323166 its reverse (661323165312), we get a palindrome (874884488478).

The spelling of 213561323166 in words is "two hundred thirteen billion, five hundred sixty-one million, three hundred twenty-three thousand, one hundred sixty-six".