1999999999980 has 72 divisors (see below), whose sum is σ = 6066958716000. Its totient is φ = 533307658752.

The previous prime is 1999999999927. The next prime is 1999999999981. The reversal of 1999999999980 is 899999999991.

It is not an unprimeable number, because it can be changed into a prime (1999999999981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3640201 + ... + 4153439.

It is an arithmetic number, because the mean of its divisors is an integer number (84263315500).

Almost surely, 2^{1999999999980} is an apocalyptic number.

1999999999980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999999999980 is an abundant number, since it is smaller than the sum of its proper divisors (4066958716020).

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

1999999999980 is a wasteful number, since it uses less digits than its factorization.

1999999999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534903 (or 534898 counting only the distinct ones).

The product of its (nonzero) digits is 27894275208, while the sum is 99.

It can be divided in two parts, 19 and 99999999980, that added together give a palindrome (99999999999).

The spelling of 1999999999980 in words is "one trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty".