1642943616778 has 8 divisors (see below), whose sum is σ = 2466113855040. Its totient is φ = 820905665100.

The previous prime is 1642943616763. The next prime is 1642943616793. The reversal of 1642943616778 is 8776163492461.

It is an interprime number because it is at equal distance from previous prime (1642943616763) and next prime (1642943616793).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283068018 + ... + 283073821.

It is an arithmetic number, because the mean of its divisors is an integer number (308264231880).

Almost surely, 2^{1642943616778} is an apocalyptic number.

1642943616778 is a deficient number, since it is larger than the sum of its proper divisors (823170238262).

1642943616778 is a wasteful number, since it uses less digits than its factorization.

1642943616778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566143292.

The product of its digits is 73156608, while the sum is 64.

The spelling of 1642943616778 in words is "one trillion, six hundred forty-two billion, nine hundred forty-three million, six hundred sixteen thousand, seven hundred seventy-eight".