166123019 has 2 divisors, whose sum is σ = 166123020. Its totient is φ = 166123018.

The previous prime is 166122989. The next prime is 166123033. The reversal of 166123019 is 910321661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166123019 - 2⁸ = 166122763 is a prime.

It is a super-2 number, since 2×166123019² = 55193714883348722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166122982 and 166123000.

It is not a weakly prime, because it can be changed into another prime (166123219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83061509 + 83061510.

It is an arithmetic number, because the mean of its divisors is an integer number (83061510).

Almost surely, 2^166123019 is an apocalyptic number.

166123019 is a deficient number, since it is larger than the sum of its proper divisors (1).

166123019 is an equidigital number, since it uses as much as digits as its factorization.

166123019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 166123019 is about 12888.8719056402. The cubic root of 166123019 is about 549.7221946902.

The spelling of 166123019 in words is "one hundred sixty-six million, one hundred twenty-three thousand, nineteen".