1999172112002 has 16 divisors (see below), whose sum is σ = 3232120876152. Its totient is φ = 921926534400.

The previous prime is 1999172112001. The next prime is 1999172112013. The reversal of 1999172112002 is 2002112719991.

It can be written as a sum of positive squares in 4 ways, for example, as 103040358001 + 1896131754001 = 320999^2 + 1377001^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1999172112001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31980113 + ... + 32042564.

Almost surely, 2^{1999172112002} is an apocalyptic number.

1999172112002 is a deficient number, since it is larger than the sum of its proper divisors (1232948764150).

1999172112002 is a wasteful number, since it uses less digits than its factorization.

1999172112002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64023893.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 1999172112002 in words is "one trillion, nine hundred ninety-nine billion, one hundred seventy-two million, one hundred twelve thousand, two".