166163459381 has 2 divisors, whose sum is σ = 166163459382. Its totient is φ = 166163459380.

The previous prime is 166163459377. The next prime is 166163459393. The reversal of 166163459381 is 183954361661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160468342225 + 5695117156 = 400585^2 + 75466^2 .

It is a cyclic number.

It is not a de Polignac number, because 166163459381 - 2² = 166163459377 is a prime.

It is a super-2 number, since 2×166163459381² (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 (166163459881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83081729690 + 83081729691.

It is an arithmetic number, because the mean of its divisors is an integer number (83081729691).

Almost surely, 2^166163459381 is an apocalyptic number.

It is an amenable number.

166163459381 is a deficient number, since it is larger than the sum of its proper divisors (1).

166163459381 is an equidigital number, since it uses as much as digits as its factorization.

166163459381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 53.

The spelling of 166163459381 in words is "one hundred sixty-six billion, one hundred sixty-three million, four hundred fifty-nine thousand, three hundred eighty-one".