1666116701 has 2 divisors, whose sum is σ = 1666116702. Its totient is φ = 1666116700.

The previous prime is 1666116691. The next prime is 1666116719. The reversal of 1666116701 is 1076116661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1468039225 + 198077476 = 38315^2 + 14074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666116701 is a prime.

It is a super-2 number, since 2×1666116701² = 5551889722702246802, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666116791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833058350 + 833058351.

It is an arithmetic number, because the mean of its divisors is an integer number (833058351).

Almost surely, 2^1666116701 is an apocalyptic number.

It is an amenable number.

1666116701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666116701 is an equidigital number, since it uses as much as digits as its factorization.

1666116701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1666116701 is about 40818.0928143391. The cubic root of 1666116701 is about 1185.5006758699.

The spelling of 1666116701 in words is "one billion, six hundred sixty-six million, one hundred sixteen thousand, seven hundred one".