1678019821620 has 24 divisors (see below), whose sum is σ = 4698455500704. Its totient is φ = 447471952416.

The previous prime is 1678019821589. The next prime is 1678019821633. The reversal of 1678019821620 is 261289108761.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13983498454 + ... + 13983498573.

It is an arithmetic number, because the mean of its divisors is an integer number (195768979196).

Almost surely, 2^{1678019821620} is an apocalyptic number.

1678019821620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1678019821620 is an abundant number, since it is smaller than the sum of its proper divisors (3020435679084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1678019821620 is a wasteful number, since it uses less digits than its factorization.

1678019821620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27966997039 (or 27966997037 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 1678019821620 in words is "one trillion, six hundred seventy-eight billion, nineteen million, eight hundred twenty-one thousand, six hundred twenty".