213317956668 has 12 divisors (see below), whose sum is σ = 497741898920. Its totient is φ = 71105985552.

The previous prime is 213317956667. The next prime is 213317956681. The reversal of 213317956668 is 866659713312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213317956667) 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, 8888248183 + ... + 8888248206.

Almost surely, 2^213317956668 is an apocalyptic number.

It is an amenable number.

213317956668 is an abundant number, since it is smaller than the sum of its proper divisors (284423942252).

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

213317956668 is a wasteful number, since it uses less digits than its factorization.

213317956668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17776496396 (or 17776496394 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 57.

The spelling of 213317956668 in words is "two hundred thirteen billion, three hundred seventeen million, nine hundred fifty-six thousand, six hundred sixty-eight".