2666616289 has 2 divisors, whose sum is σ = 2666616290. Its totient is φ = 2666616288.

The previous prime is 2666616263. The next prime is 2666616391. The reversal of 2666616289 is 9826166662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1980962064 + 685654225 = 44508^2 + 26185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666616289 - 2³¹ = 519132641 is a prime.

It is a super-2 number, since 2×2666616289² = 14221684865520263042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2666616259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333308144 + 1333308145.

It is an arithmetic number, because the mean of its divisors is an integer number (1333308145).

Almost surely, 2^2666616289 is an apocalyptic number.

It is an amenable number.

2666616289 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666616289 is an equidigital number, since it uses as much as digits as its factorization.

2666616289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 52.

The square root of 2666616289 is about 51639.2901674684. The cubic root of 2666616289 is about 1386.7138161655.

The spelling of 2666616289 in words is "two billion, six hundred sixty-six million, six hundred sixteen thousand, two hundred eighty-nine".