1066161989 has 2 divisors, whose sum is σ = 1066161990. Its totient is φ = 1066161988.

The previous prime is 1066161983. The next prime is 1066162039. The reversal of 1066161989 is 9891616601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535228225 + 530933764 = 23135^2 + 23042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066161989 is a prime.

It is a super-2 number, since 2×1066161989² = 2273402773576872242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066161983) 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, 533080994 + 533080995.

It is an arithmetic number, because the mean of its divisors is an integer number (533080995).

Almost surely, 2^1066161989 is an apocalyptic number.

It is an amenable number.

1066161989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066161989 is an equidigital number, since it uses as much as digits as its factorization.

1066161989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 1066161989 is about 32652.1360557009. The cubic root of 1066161989 is about 1021.5847430807.

The spelling of 1066161989 in words is "one billion, sixty-six million, one hundred sixty-one thousand, nine hundred eighty-nine".