166019281 has 2 divisors, whose sum is σ = 166019282. Its totient is φ = 166019280.

The previous prime is 166019279. The next prime is 166019303. The reversal of 166019281 is 182910661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144480400 + 21538881 = 12020^2 + 4641^2 .

It is a cyclic number.

It is not a de Polignac number, because 166019281 - 2¹ = 166019279 is a prime.

It is a super-2 number, since 2×166019281² = 55124803327513922, which contains 22 as substring.

Together with 166019279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166019201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83009640 + 83009641.

It is an arithmetic number, because the mean of its divisors is an integer number (83009641).

Almost surely, 2^166019281 is an apocalyptic number.

It is an amenable number.

166019281 is a deficient number, since it is larger than the sum of its proper divisors (1).

166019281 is an equidigital number, since it uses as much as digits as its factorization.

166019281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 166019281 is about 12884.8469529133. The cubic root of 166019281 is about 549.6077434521.

The spelling of 166019281 in words is "one hundred sixty-six million, nineteen thousand, two hundred eighty-one".