1666016939 has 2 divisors, whose sum is σ = 1666016940. Its totient is φ = 1666016938.

The previous prime is 1666016927. The next prime is 1666016951. The reversal of 1666016939 is 9396106661.

It is a balanced prime because it is at equal distance from previous prime (1666016927) and next prime (1666016951).

It is a cyclic number.

It is not a de Polignac number, because 1666016939 - 2⁴ = 1666016923 is a prime.

It is a super-2 number, since 2×1666016939² = 5551224882069859442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1666016893 and 1666016902.

It is not a weakly prime, because it can be changed into another prime (1666016839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833008469 + 833008470.

It is an arithmetic number, because the mean of its divisors is an integer number (833008470).

Almost surely, 2^1666016939 is an apocalyptic number.

1666016939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666016939 is an equidigital number, since it uses as much as digits as its factorization.

1666016939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 1666016939 is about 40816.8707644278. The cubic root of 1666016939 is about 1185.4770140062.

The spelling of 1666016939 in words is "one billion, six hundred sixty-six million, sixteen thousand, nine hundred thirty-nine".