2666158849 has 4 divisors (see below), whose sum is σ = 2696115780. Its totient is φ = 2636201920.

The previous prime is 2666158837. The next prime is 2666158853. The reversal of 2666158849 is 9488516662.

2666158849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 571449025 + 2094709824 = 23905^2 + 45768^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666158849 - 2⁷ = 2666158721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2666158849.

It is not an unprimeable number, because it can be changed into a prime (2666158249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14978332 + ... + 14978509.

It is an arithmetic number, because the mean of its divisors is an integer number (674028945).

Almost surely, 2^2666158849 is an apocalyptic number.

It is an amenable number.

2666158849 is a deficient number, since it is larger than the sum of its proper divisors (29956931).

2666158849 is an equidigital number, since it uses as much as digits as its factorization.

2666158849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29956930.

The product of its digits is 4976640, while the sum is 55.

The square root of 2666158849 is about 51634.8607919107. The cubic root of 2666158849 is about 1386.6345178370.

The spelling of 2666158849 in words is "two billion, six hundred sixty-six million, one hundred fifty-eight thousand, eight hundred forty-nine".