1668486646 has 16 divisors (see below), whose sum is σ = 2524483584. Its totient is φ = 827019304.

The previous prime is 1668486643. The next prime is 1668486661. The reversal of 1668486646 is 6466848661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668486643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121401 + ... + 134443.

It is an arithmetic number, because the mean of its divisors is an integer number (157780224).

Almost surely, 2^1668486646 is an apocalyptic number.

1668486646 is a deficient number, since it is larger than the sum of its proper divisors (855996938).

1668486646 is a wasteful number, since it uses less digits than its factorization.

1668486646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13595.

The product of its digits is 7962624, while the sum is 55.

The square root of 1668486646 is about 40847.1130681227. The cubic root of 1668486646 is about 1186.0625093244.

The spelling of 1668486646 in words is "one billion, six hundred sixty-eight million, four hundred eighty-six thousand, six hundred forty-six".