1801648666 has 32 divisors (see below), whose sum is σ = 2885621760. Its totient is φ = 841221936.

The previous prime is 1801648619. The next prime is 1801648679. The reversal of 1801648666 is 6668461081.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 905725 + ... + 907711.

It is an arithmetic number, because the mean of its divisors is an integer number (90175680).

Almost surely, 2^1801648666 is an apocalyptic number.

1801648666 is a deficient number, since it is larger than the sum of its proper divisors (1083973094).

1801648666 is a wasteful number, since it uses less digits than its factorization.

1801648666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338.

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 1801648666 is about 42445.8321393279. The cubic root of 1801648666 is about 1216.8116754000.

The spelling of 1801648666 in words is "one billion, eight hundred one million, six hundred forty-eight thousand, six hundred sixty-six".