166813713593 has 2 divisors, whose sum is σ = 166813713594. Its totient is φ = 166813713592.

The previous prime is 166813713581. The next prime is 166813713617. The reversal of 166813713593 is 395317318661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165968241664 + 845471929 = 407392^2 + 29077^2 .

It is a cyclic number.

It is not a de Polignac number, because 166813713593 - 2⁶ = 166813713529 is a prime.

It is not a weakly prime, because it can be changed into another prime (166813713553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83406856796 + 83406856797.

It is an arithmetic number, because the mean of its divisors is an integer number (83406856797).

Almost surely, 2^166813713593 is an apocalyptic number.

It is an amenable number.

166813713593 is a deficient number, since it is larger than the sum of its proper divisors (1).

166813713593 is an equidigital number, since it uses as much as digits as its factorization.

166813713593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The spelling of 166813713593 in words is "one hundred sixty-six billion, eight hundred thirteen million, seven hundred thirteen thousand, five hundred ninety-three".