2166038549 has 4 divisors (see below), whose sum is σ = 2169051840. Its totient is φ = 2163025260.

The previous prime is 2166038533. The next prime is 2166038573. The reversal of 2166038549 is 9458306612.

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 2166038549 - 2⁴ = 2166038533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166038519) 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, 1505567 + ... + 1507004.

It is an arithmetic number, because the mean of its divisors is an integer number (542262960).

Almost surely, 2^2166038549 is an apocalyptic number.

It is an amenable number.

2166038549 is a deficient number, since it is larger than the sum of its proper divisors (3013291).

2166038549 is an equidigital number, since it uses as much as digits as its factorization.

2166038549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013290.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 2166038549 is about 46540.7192574416. The cubic root of 2166038549 is about 1293.8642913212.

The spelling of 2166038549 in words is "two billion, one hundred sixty-six million, thirty-eight thousand, five hundred forty-nine".