166864445317 has 2 divisors, whose sum is σ = 166864445318. Its totient is φ = 166864445316.

The previous prime is 166864445233. The next prime is 166864445329. The reversal of 166864445317 is 713544468661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159349462596 + 7514982721 = 399186^2 + 86689^2 .

It is a cyclic number.

It is not a de Polignac number, because 166864445317 - 2¹⁵ = 166864412549 is a prime.

It is a super-2 number, since 2×166864445317² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166864475317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83432222658 + 83432222659.

It is an arithmetic number, because the mean of its divisors is an integer number (83432222659).

Almost surely, 2^166864445317 is an apocalyptic number.

It is an amenable number.

166864445317 is a deficient number, since it is larger than the sum of its proper divisors (1).

166864445317 is an equidigital number, since it uses as much as digits as its factorization.

166864445317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 55.

The spelling of 166864445317 in words is "one hundred sixty-six billion, eight hundred sixty-four million, four hundred forty-five thousand, three hundred seventeen".