1668917642 has 32 divisors (see below), whose sum is σ = 3093769728. Its totient is φ = 658849536.

The previous prime is 1668917629. The next prime is 1668917681. The reversal of 1668917642 is 2467198661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63413 + ... + 85784.

It is an arithmetic number, because the mean of its divisors is an integer number (96680304).

Almost surely, 2^1668917642 is an apocalyptic number.

1668917642 is a deficient number, since it is larger than the sum of its proper divisors (1424852086).

1668917642 is a wasteful number, since it uses less digits than its factorization.

1668917642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149270.

The product of its digits is 870912, while the sum is 50.

The square root of 1668917642 is about 40852.3884491470. The cubic root of 1668917642 is about 1186.1646266511.

The spelling of 1668917642 in words is "one billion, six hundred sixty-eight million, nine hundred seventeen thousand, six hundred forty-two".