166716056593 has 2 divisors, whose sum is σ = 166716056594. Its totient is φ = 166716056592.

The previous prime is 166716056561. The next prime is 166716056599. The reversal of 166716056593 is 395650617661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90403651584 + 76312405009 = 300672^2 + 276247^2 .

It is a cyclic number.

It is not a de Polignac number, because 166716056593 - 2⁵ = 166716056561 is a prime.

It is not a weakly prime, because it can be changed into another prime (166716056599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83358028296 + 83358028297.

It is an arithmetic number, because the mean of its divisors is an integer number (83358028297).

Almost surely, 2^166716056593 is an apocalyptic number.

It is an amenable number.

166716056593 is a deficient number, since it is larger than the sum of its proper divisors (1).

166716056593 is an equidigital number, since it uses as much as digits as its factorization.

166716056593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6123600, while the sum is 55.

The spelling of 166716056593 in words is "one hundred sixty-six billion, seven hundred sixteen million, fifty-six thousand, five hundred ninety-three".