1999556001100 has 36 divisors (see below), whose sum is σ = 4958898884464. Its totient is φ = 685562057280.

The previous prime is 1999556001059. The next prime is 1999556001101. The reversal of 1999556001100 is 11006559991.

It is not an unprimeable number, because it can be changed into a prime (1999556001101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1428253587 + ... + 1428254986.

Almost surely, 2^{1999556001100} is an apocalyptic number.

1999556001100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999556001100 is an abundant number, since it is smaller than the sum of its proper divisors (2959342883364).

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

1999556001100 is a wasteful number, since it uses less digits than its factorization.

1999556001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2856508594 (or 2856508587 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 46.

The spelling of 1999556001100 in words is "one trillion, nine hundred ninety-nine billion, five hundred fifty-six million, one thousand, one hundred".