1066643321 has 2 divisors, whose sum is σ = 1066643322. Its totient is φ = 1066643320.

The previous prime is 1066643309. The next prime is 1066643329. The reversal of 1066643321 is 1233466601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894010000 + 172633321 = 29900^2 + 13139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066643321 is a prime.

It is a super-2 number, since 2×1066643321² = 2275455948467818082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1066643329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533321660 + 533321661.

It is an arithmetic number, because the mean of its divisors is an integer number (533321661).

Almost surely, 2^1066643321 is an apocalyptic number.

It is an amenable number.

1066643321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066643321 is an equidigital number, since it uses as much as digits as its factorization.

1066643321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 1066643321 is about 32659.5058290844. The cubic root of 1066643321 is about 1021.7384556351.

The spelling of 1066643321 in words is "one billion, sixty-six million, six hundred forty-three thousand, three hundred twenty-one".