2116646662661 has 2 divisors, whose sum is σ = 2116646662662. Its totient is φ = 2116646662660.

The previous prime is 2116646662649. The next prime is 2116646662667. The reversal of 2116646662661 is 1662666466112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1229648121025 + 886998541636 = 1108895^2 + 941806^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116646662661 - 2¹⁰ = 2116646661637 is a prime.

It is a super-3 number, since 3×2116646662661³ (a number of 38 digits) contains 333 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 (2116646662667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058323331330 + 1058323331331.

It is an arithmetic number, because the mean of its divisors is an integer number (1058323331331).

Almost surely, 2^{2116646662661} is an apocalyptic number.

It is an amenable number.

2116646662661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116646662661 is an equidigital number, since it uses as much as digits as its factorization.

2116646662661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 53.

The spelling of 2116646662661 in words is "two trillion, one hundred sixteen billion, six hundred forty-six million, six hundred sixty-two thousand, six hundred sixty-one".