1999668346506 has 192 divisors, whose sum is σ = 4707072414720. Its totient is φ = 611631820800.

The previous prime is 1999668346499. The next prime is 1999668346517. The reversal of 1999668346506 is 6056438669991.

1999668346506 is a `hidden beast` number, since 1 + 99 + 96 + 68 + 346 + 50 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1506908415 + ... + 1506909741.

It is an arithmetic number, because the mean of its divisors is an integer number (24516002160).

Almost surely, 2^{1999668346506} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999668346506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2353536207360).

1999668346506 is an abundant number, since it is smaller than the sum of its proper divisors (2707404068214).

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

1999668346506 is a wasteful number, since it uses less digits than its factorization.

1999668346506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101 (or 2098 counting only the distinct ones).

The product of its (nonzero) digits is 453496320, while the sum is 72.

The spelling of 1999668346506 in words is "one trillion, nine hundred ninety-nine billion, six hundred sixty-eight million, three hundred forty-six thousand, five hundred six".