1678620791998 has 4 divisors (see below), whose sum is σ = 2517931188000. Its totient is φ = 839310395998.

The previous prime is 1678620791987. The next prime is 1678620792049. The reversal of 1678620791998 is 8991970268761.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1678620791998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419655197998 + ... + 419655198001.

It is an arithmetic number, because the mean of its divisors is an integer number (629482797000).

Almost surely, 2^{1678620791998} is an apocalyptic number.

1678620791998 is a deficient number, since it is larger than the sum of its proper divisors (839310396002).

1678620791998 is an equidigital number, since it uses as much as digits as its factorization.

1678620791998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839310396001.

The product of its (nonzero) digits is 164602368, while the sum is 73.

The spelling of 1678620791998 in words is "one trillion, six hundred seventy-eight billion, six hundred twenty million, seven hundred ninety-one thousand, nine hundred ninety-eight".