1668639702394 has 32 divisors (see below), whose sum is σ = 3081182846976. Its totient is φ = 661972869360.

The previous prime is 1668639702347. The next prime is 1668639702397. The reversal of 1668639702394 is 4932079368661.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1668639702397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83572452 + ... + 83592415.

It is an arithmetic number, because the mean of its divisors is an integer number (96286963968).

Almost surely, 2^{1668639702394} is an apocalyptic number.

1668639702394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1668639702394 is a deficient number, since it is larger than the sum of its proper divisors (1412543144582).

1668639702394 is a wasteful number, since it uses less digits than its factorization.

1668639702394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167164930.

The product of its (nonzero) digits is 70543872, while the sum is 64.

The spelling of 1668639702394 in words is "one trillion, six hundred sixty-eight billion, six hundred thirty-nine million, seven hundred two thousand, three hundred ninety-four".