1066717021 has 2 divisors, whose sum is σ = 1066717022. Its totient is φ = 1066717020.

The previous prime is 1066717007. The next prime is 1066717033. The reversal of 1066717021 is 1207176601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 807184921 + 259532100 = 28411^2 + 16110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066717021 - 2⁹ = 1066716509 is a prime.

It is a super-2 number, since 2×1066717021² = 2275770405782228882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066717321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533358510 + 533358511.

It is an arithmetic number, because the mean of its divisors is an integer number (533358511).

Almost surely, 2^1066717021 is an apocalyptic number.

It is an amenable number.

1066717021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066717021 is an equidigital number, since it uses as much as digits as its factorization.

1066717021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 1066717021 is about 32660.6341181551. The cubic root of 1066717021 is about 1021.7619875220.

The spelling of 1066717021 in words is "one billion, sixty-six million, seven hundred seventeen thousand, twenty-one".