1666050849 has 20 divisors (see below), whose sum is σ = 2529599380. Its totient is φ = 1092489120.

The previous prime is 1666050833. The next prime is 1666050857. The reversal of 1666050849 is 9480506661.

1666050849 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 60606225 + 1605444624 = 7785^2 + 40068^2 .

It is not a de Polignac number, because 1666050849 - 2⁴ = 1666050833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666050809) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 163654 + ... + 173535.

It is an arithmetic number, because the mean of its divisors is an integer number (126479969).

Almost surely, 2^1666050849 is an apocalyptic number.

It is an amenable number.

1666050849 is a deficient number, since it is larger than the sum of its proper divisors (863548531).

1666050849 is an equidigital number, since it uses as much as digits as its factorization.

1666050849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337262 (or 337253 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1666050849 is about 40817.2861542754. The cubic root of 1666050849 is about 1185.4850569922.

The spelling of 1666050849 in words is "one billion, six hundred sixty-six million, fifty thousand, eight hundred forty-nine".