1642668181268 has 12 divisors (see below), whose sum is σ = 2876513246880. Its totient is φ = 820807253592.

The previous prime is 1642668181229. The next prime is 1642668181289. The reversal of 1642668181268 is 8621818662461.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131702246 + ... + 131714717.

It is an arithmetic number, because the mean of its divisors is an integer number (239709437240).

Almost surely, 2^{1642668181268} is an apocalyptic number.

It is an amenable number.

1642668181268 is a deficient number, since it is larger than the sum of its proper divisors (1233845065612).

1642668181268 is a wasteful number, since it uses less digits than its factorization.

1642668181268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263418526 (or 263418524 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 59.

The spelling of 1642668181268 in words is "one trillion, six hundred forty-two billion, six hundred sixty-eight million, one hundred eighty-one thousand, two hundred sixty-eight".