2666666917 has 2 divisors, whose sum is σ = 2666666918. Its totient is φ = 2666666916.

The previous prime is 2666666909. The next prime is 2666666939. The reversal of 2666666917 is 7196666662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1545354721 + 1121312196 = 39311^2 + 33486^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666666917 - 2³ = 2666666909 is a prime.

It is a super-2 number, since 2×2666666917² = 14222224892444569778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666666987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333333458 + 1333333459.

It is an arithmetic number, because the mean of its divisors is an integer number (1333333459).

Almost surely, 2^2666666917 is an apocalyptic number.

It is an amenable number.

2666666917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666666917 is an equidigital number, since it uses as much as digits as its factorization.

2666666917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 55.

The square root of 2666666917 is about 51639.7803732742. The cubic root of 2666666917 is about 1386.7225920941.

The spelling of 2666666917 in words is "two billion, six hundred sixty-six million, six hundred sixty-six thousand, nine hundred seventeen".