166464545464517 has 2 divisors, whose sum is σ = 166464545464518. Its totient is φ = 166464545464516.

The previous prime is 166464545464501. The next prime is 166464545464673. The reversal of 166464545464517 is 715464545464661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166358429796001 + 106115668516 = 12898001^2 + 325754^2 .

It is a cyclic number.

It is not a de Polignac number, because 166464545464517 - 2⁴ = 166464545464501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166464545464117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83232272732258 + 83232272732259.

It is an arithmetic number, because the mean of its divisors is an integer number (83232272732259).

Almost surely, 2^{166464545464517} is an apocalyptic number.

It is an amenable number.

166464545464517 is a deficient number, since it is larger than the sum of its proper divisors (1).

166464545464517 is an equidigital number, since it uses as much as digits as its factorization.

166464545464517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216000, while the sum is 68.

The spelling of 166464545464517 in words is "one hundred sixty-six trillion, four hundred sixty-four billion, five hundred forty-five million, four hundred sixty-four thousand, five hundred seventeen".