2666788317 has 12 divisors (see below), whose sum is σ = 4078617660. Its totient is φ = 1673278848.

The previous prime is 2666788309. The next prime is 2666788321. The reversal of 2666788317 is 7138876662.

It can be written as a sum of positive squares in 2 ways, for example, as 1864426041 + 802362276 = 43179^2 + 28326^2 .

It is not a de Polignac number, because 2666788317 - 2³ = 2666788309 is a prime.

It is a super-2 number, since 2×2666788317² = 14223519855375384978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666788387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8714842 + ... + 8715147.

It is an arithmetic number, because the mean of its divisors is an integer number (339884805).

Almost surely, 2^2666788317 is an apocalyptic number.

It is an amenable number.

2666788317 is a deficient number, since it is larger than the sum of its proper divisors (1411829343).

2666788317 is a wasteful number, since it uses less digits than its factorization.

2666788317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17430012 (or 17430009 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 2666788317 is about 51640.9558102869. The cubic root of 2666788317 is about 1386.7436352882.

The spelling of 2666788317 in words is "two billion, six hundred sixty-six million, seven hundred eighty-eight thousand, three hundred seventeen".