13466172217 has 2 divisors, whose sum is σ = 13466172218. Its totient is φ = 13466172216.

The previous prime is 13466172169. The next prime is 13466172253. The reversal of 13466172217 is 71227166431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11867052096 + 1599120121 = 108936^2 + 39989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13466172217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13466172217.

It is not a weakly prime, because it can be changed into another prime (13466172017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6733086108 + 6733086109.

It is an arithmetic number, because the mean of its divisors is an integer number (6733086109).

Almost surely, 2^13466172217 is an apocalyptic number.

It is an amenable number.

13466172217 is a deficient number, since it is larger than the sum of its proper divisors (1).

13466172217 is an equidigital number, since it uses as much as digits as its factorization.

13466172217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The spelling of 13466172217 in words is "thirteen billion, four hundred sixty-six million, one hundred seventy-two thousand, two hundred seventeen".