1066645091 has 2 divisors, whose sum is σ = 1066645092. Its totient is φ = 1066645090.

The previous prime is 1066645067. The next prime is 1066645157. The reversal of 1066645091 is 1905466601.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066645091 is a prime.

It is a super-2 number, since 2×1066645091² = 2275463500308796562, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1066645001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533322545 + 533322546.

It is an arithmetic number, because the mean of its divisors is an integer number (533322546).

Almost surely, 2^1066645091 is an apocalyptic number.

1066645091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066645091 is an equidigital number, since it uses as much as digits as its factorization.

1066645091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1066645091 is about 32659.5329268500. The cubic root of 1066645091 is about 1021.7390207963.

The spelling of 1066645091 in words is "one billion, sixty-six million, six hundred forty-five thousand, ninety-one".