1999504465920 has 1792 divisors, whose sum is σ = 8287417877760. Its totient is φ = 458647142400.

The previous prime is 1999504465909. The next prime is 1999504465943. The reversal of 1999504465920 is 295644059991.

1999504465920 is a `hidden beast` number, since 1 + 9 + 99 + 50 + 446 + 59 + 2 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 19797073870 + ... + 19797073970.

It is an arithmetic number, because the mean of its divisors is an integer number (4624675155).

Almost surely, 2^{1999504465920} is an apocalyptic number.

1999504465920 is a gapful number since it is divisible by the number (10) 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 1999504465920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4143708938880).

1999504465920 is an abundant number, since it is smaller than the sum of its proper divisors (6287913411840).

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

1999504465920 is an equidigital number, since it uses as much as digits as its factorization.

1999504465920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 31492800, while the sum is 63.

The spelling of 1999504465920 in words is "one trillion, nine hundred ninety-nine billion, five hundred four million, four hundred sixty-five thousand, nine hundred twenty".