1999123160920 has 32 divisors (see below), whose sum is σ = 4517842230000. Its totient is φ = 796126576768.

The previous prime is 1999123160767. The next prime is 1999123160959. The reversal of 1999123160920 is 290613219991.

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, 110074795 + ... + 110092954.

Almost surely, 2^{1999123160920} is an apocalyptic number.

1999123160920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999123160920 is an abundant number, since it is smaller than the sum of its proper divisors (2518719069080).

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

1999123160920 is a wasteful number, since it uses less digits than its factorization.

1999123160920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220167987 (or 220167983 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 52.

The spelling of 1999123160920 in words is "one trillion, nine hundred ninety-nine billion, one hundred twenty-three million, one hundred sixty thousand, nine hundred twenty".