1999506155004 has 144 divisors (see below), whose sum is σ = 5230886169600. Its totient is φ = 643503052800.

The previous prime is 1999506154979. The next prime is 1999506155039. The reversal of 1999506155004 is 4005516059991.

1999506155004 is a `hidden beast` number, since 19 + 9 + 9 + 5 + 0 + 615 + 5 + 0 + 0 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 228432292 + ... + 228441044.

It is an arithmetic number, because the mean of its divisors is an integer number (36325598400).

Almost surely, 2^{1999506155004} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999506155004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2615443084800).

1999506155004 is an abundant number, since it is smaller than the sum of its proper divisors (3231380014596).

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

1999506155004 is a wasteful number, since it uses less digits than its factorization.

1999506155004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10100 (or 10095 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 54.

The spelling of 1999506155004 in words is "one trillion, nine hundred ninety-nine billion, five hundred six million, one hundred fifty-five thousand, four".