213966836917 has 2 divisors, whose sum is σ = 213966836918. Its totient is φ = 213966836916.

The previous prime is 213966836879. The next prime is 213966836969. The reversal of 213966836917 is 719638669312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194129241201 + 19837595716 = 440601^2 + 140846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213966836917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213966836977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106983418458 + 106983418459.

It is an arithmetic number, because the mean of its divisors is an integer number (106983418459).

Almost surely, 2^213966836917 is an apocalyptic number.

It is an amenable number.

213966836917 is a deficient number, since it is larger than the sum of its proper divisors (1).

213966836917 is an equidigital number, since it uses as much as digits as its factorization.

213966836917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 61.

The spelling of 213966836917 in words is "two hundred thirteen billion, nine hundred sixty-six million, eight hundred thirty-six thousand, nine hundred seventeen".