1668910636 has 12 divisors (see below), whose sum is σ = 3047576112. Its totient is φ = 798174608.

The previous prime is 1668910591. The next prime is 1668910697. The reversal of 1668910636 is 6360198661.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9070075 + ... + 9070258.

It is an arithmetic number, because the mean of its divisors is an integer number (253964676).

Almost surely, 2^1668910636 is an apocalyptic number.

It is an amenable number.

1668910636 is a deficient number, since it is larger than the sum of its proper divisors (1378665476).

1668910636 is a wasteful number, since it uses less digits than its factorization.

1668910636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18140360 (or 18140358 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1668910636 is about 40852.3027013166. The cubic root of 1668910636 is about 1186.1629668366.

The spelling of 1668910636 in words is "one billion, six hundred sixty-eight million, nine hundred ten thousand, six hundred thirty-six".