199781172324 has 36 divisors (see below), whose sum is σ = 511920255756. Its totient is φ = 65681480448.

The previous prime is 199781172301. The next prime is 199781172329. The reversal of 199781172324 is 423271187991.

It can be written as a sum of positive squares in 2 ways, for example, as 168196773924 + 31584398400 = 410118^2 + 177720^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (199781172329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38007489 + ... + 38012744.

Almost surely, 2^199781172324 is an apocalyptic number.

It is an amenable number.

199781172324 is an abundant number, since it is smaller than the sum of its proper divisors (312139083432).

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

199781172324 is a wasteful number, since it uses less digits than its factorization.

199781172324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76020316 (or 76020311 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The spelling of 199781172324 in words is "one hundred ninety-nine billion, seven hundred eighty-one million, one hundred seventy-two thousand, three hundred twenty-four".