1066639973 has 8 divisors (see below), whose sum is σ = 1272018048. Its totient is φ = 874512144.

The previous prime is 1066639967. The next prime is 1066640009. The reversal of 1066639973 is 3799366601.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1066639973 - 2⁴ = 1066639957 is a prime.

It is a super-2 number, since 2×1066639973² = 2275441664002881458, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066639913) 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 in 7 ways as a sum of consecutive naturals, for example, 3312386 + ... + 3312707.

It is an arithmetic number, because the mean of its divisors is an integer number (159002256).

Almost surely, 2^1066639973 is an apocalyptic number.

It is an amenable number.

1066639973 is a deficient number, since it is larger than the sum of its proper divisors (205378075).

1066639973 is an equidigital number, since it uses as much as digits as its factorization.

1066639973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6625123.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The square root of 1066639973 is about 32659.4545729104. The cubic root of 1066639973 is about 1021.7373866167.

The spelling of 1066639973 in words is "one billion, sixty-six million, six hundred thirty-nine thousand, nine hundred seventy-three".