1999813988736 has 256 divisors, whose sum is σ = 5949129600000. Its totient is φ = 661324621824.

The previous prime is 1999813988671. The next prime is 1999813988747. The reversal of 1999813988736 is 6378893189991.

1999813988736 is a `hidden beast` number, since 199 + 9 + 8 + 1 + 398 + 8 + 7 + 36 = 666.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 298342761 + ... + 298349463.

It is an arithmetic number, because the mean of its divisors is an integer number (23238787500).

Almost surely, 2^{1999813988736} is an apocalyptic number.

1999813988736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999813988736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2974564800000).

1999813988736 is an abundant number, since it is smaller than the sum of its proper divisors (3949315611264).

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

1999813988736 is a wasteful number, since it uses less digits than its factorization.

1999813988736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7398 (or 7380 counting only the distinct ones).

The product of its digits is 1269789696, while the sum is 81.

The spelling of 1999813988736 in words is "one trillion, nine hundred ninety-nine billion, eight hundred thirteen million, nine hundred eighty-eight thousand, seven hundred thirty-six".