1668361849 has 12 divisors (see below), whose sum is σ = 2117179728. Its totient is φ = 1300021800.

The previous prime is 1668361847. The next prime is 1668361883. The reversal of 1668361849 is 9481638661.

It is not a de Polignac number, because 1668361849 - 2¹ = 1668361847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1668361796 and 1668361805.

It is not an unprimeable number, because it can be changed into a prime (1668361843) 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 11 ways as a sum of consecutive naturals, for example, 1547107 + ... + 1548184.

It is an arithmetic number, because the mean of its divisors is an integer number (176431644).

Almost surely, 2^1668361849 is an apocalyptic number.

It is an amenable number.

1668361849 is a deficient number, since it is larger than the sum of its proper divisors (448817879).

1668361849 is a wasteful number, since it uses less digits than its factorization.

1668361849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3095316 (or 3095309 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The square root of 1668361849 is about 40845.5854285381. The cubic root of 1668361849 is about 1186.0329374698.

The spelling of 1668361849 in words is "one billion, six hundred sixty-eight million, three hundred sixty-one thousand, eight hundred forty-nine".