1011666071665 has 8 divisors (see below), whose sum is σ = 1214016594408. Its totient is φ = 809321318400.

The previous prime is 1011666071651. The next prime is 1011666071677. The reversal of 1011666071665 is 5661706661101.

It can be written as a sum of positive squares in 4 ways, for example, as 22731291361 + 988934780304 = 150769^2 + 994452^2 .

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

It is not a de Polignac number, because 1011666071665 - 2⁹ = 1011666071153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1046736 + ... + 1766065.

It is an arithmetic number, because the mean of its divisors is an integer number (151752074301).

Almost surely, 2^{1011666071665} is an apocalyptic number.

It is an amenable number.

1011666071665 is a deficient number, since it is larger than the sum of its proper divisors (202350522743).

1011666071665 is an equidigital number, since it uses as much as digits as its factorization.

1011666071665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884739.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 1011666071665 in words is "one trillion, eleven billion, six hundred sixty-six million, seventy-one thousand, six hundred sixty-five".