2666804549 has 4 divisors (see below), whose sum is σ = 2691728064. Its totient is φ = 2641881036.

The previous prime is 2666804509. The next prime is 2666804579. The reversal of 2666804549 is 9454086662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2666804549 - 2²⁰ = 2665755973 is a prime.

It is a super-2 number, since 2×2666804549² = 14223693005134186802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2666804497 and 2666804506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666804509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12461597 + ... + 12461810.

It is an arithmetic number, because the mean of its divisors is an integer number (672932016).

Almost surely, 2^2666804549 is an apocalyptic number.

It is an amenable number.

2666804549 is a deficient number, since it is larger than the sum of its proper divisors (24923515).

2666804549 is a wasteful number, since it uses less digits than its factorization.

2666804549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24923514.

The product of its (nonzero) digits is 2488320, while the sum is 50.

The square root of 2666804549 is about 51641.1129721272. The cubic root of 2666804549 is about 1386.7464488569.

The spelling of 2666804549 in words is "two billion, six hundred sixty-six million, eight hundred four thousand, five hundred forty-nine".