1066206917 has 4 divisors (see below), whose sum is σ = 1078186860. Its totient is φ = 1054226976.

The previous prime is 1066206893. The next prime is 1066206943. The reversal of 1066206917 is 7196026601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7196026601 = 30851 ⋅233251.

It can be written as a sum of positive squares in 2 ways, for example, as 698756356 + 367450561 = 26434^2 + 19169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066206917 - 2⁶ = 1066206853 is a prime.

It is a super-2 number, since 2×1066206917² = 2273594379717289778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066206217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5989838 + ... + 5990015.

It is an arithmetic number, because the mean of its divisors is an integer number (269546715).

Almost surely, 2^1066206917 is an apocalyptic number.

It is an amenable number.

1066206917 is a deficient number, since it is larger than the sum of its proper divisors (11979943).

1066206917 is an equidigital number, since it uses as much as digits as its factorization.

1066206917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11979942.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 1066206917 is about 32652.8240279459. The cubic root of 1066206917 is about 1021.5990927184.

The spelling of 1066206917 in words is "one billion, sixty-six million, two hundred six thousand, nine hundred seventeen".