1909233560172 has 12 divisors (see below), whose sum is σ = 4454878307096. Its totient is φ = 636411186720.

The previous prime is 1909233560153. The next prime is 1909233560189. The reversal of 1909233560172 is 2710653329091.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79551398329 + ... + 79551398352.

Almost surely, 2^{1909233560172} is an apocalyptic number.

1909233560172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1909233560172 is an abundant number, since it is smaller than the sum of its proper divisors (2545644746924).

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

1909233560172 is a wasteful number, since it uses less digits than its factorization.

1909233560172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159102796688 (or 159102796686 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 48.

The spelling of 1909233560172 in words is "one trillion, nine hundred nine billion, two hundred thirty-three million, five hundred sixty thousand, one hundred seventy-two".