166845026393 has 2 divisors, whose sum is σ = 166845026394. Its totient is φ = 166845026392.

The previous prime is 166845026353. The next prime is 166845026407. The reversal of 166845026393 is 393620548661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162044892304 + 4800134089 = 402548^2 + 69283^2 .

It is an emirp because it is prime and its reverse (393620548661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166845026393 is a prime.

It is not a weakly prime, because it can be changed into another prime (166845026303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83422513196 + 83422513197.

It is an arithmetic number, because the mean of its divisors is an integer number (83422513197).

Almost surely, 2^166845026393 is an apocalyptic number.

It is an amenable number.

166845026393 is a deficient number, since it is larger than the sum of its proper divisors (1).

166845026393 is an equidigital number, since it uses as much as digits as its factorization.

166845026393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 166845026393 in words is "one hundred sixty-six billion, eight hundred forty-five million, twenty-six thousand, three hundred ninety-three".