2666889109 has 2 divisors, whose sum is σ = 2666889110. Its totient is φ = 2666889108.

The previous prime is 2666889107. The next prime is 2666889119. The reversal of 2666889109 is 9019886662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2635282225 + 31606884 = 51335^2 + 5622^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666889109 - 2¹ = 2666889107 is a prime.

It is a super-2 number, since 2×2666889109² = 14224595039405627762, which contains 22 as substring.

Together with 2666889107, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2666889109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666889101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333444554 + 1333444555.

It is an arithmetic number, because the mean of its divisors is an integer number (1333444555).

Almost surely, 2^2666889109 is an apocalyptic number.

It is an amenable number.

2666889109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666889109 is an equidigital number, since it uses as much as digits as its factorization.

2666889109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The square root of 2666889109 is about 51641.9316931503. The cubic root of 2666889109 is about 1386.7611058541.

The spelling of 2666889109 in words is "two billion, six hundred sixty-six million, eight hundred eighty-nine thousand, one hundred nine".