1666000069 has 2 divisors, whose sum is σ = 1666000070. Its totient is φ = 1666000068.

The previous prime is 1666000057. The next prime is 1666000079. The reversal of 1666000069 is 9600006661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1525293025 + 140707044 = 39055^2 + 11862^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666000069 - 2⁹ = 1665999557 is a prime.

It is a super-2 number, since 2×1666000069² = 5551112459816009522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1665999998 and 1666000043.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666000079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833000034 + 833000035.

It is an arithmetic number, because the mean of its divisors is an integer number (833000035).

Almost surely, 2^1666000069 is an apocalyptic number.

It is an amenable number.

1666000069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666000069 is an equidigital number, since it uses as much as digits as its factorization.

1666000069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 1666000069 is about 40816.6641091601. The cubic root of 1666000069 is about 1185.4730126333.

The spelling of 1666000069 in words is "one billion, six hundred sixty-six million, sixty-nine", and thus it is an aban number.