1909718712916 has 144 divisors (see below), whose sum is σ = 4017835510416. Its totient is φ = 791335028736.

The previous prime is 1909718712851. The next prime is 1909718712997. The reversal of 1909718712916 is 6192178179091.

It can be written as a sum of positive squares in 8 ways, for example, as 210684672016 + 1699034040900 = 459004^2 + 1303470^2 .

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1279114266 + ... + 1279115758.

It is an arithmetic number, because the mean of its divisors is an integer number (27901635489).

Almost surely, 2^{1909718712916} 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 1909718712916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2008917755208).

1909718712916 is an abundant number, since it is smaller than the sum of its proper divisors (2108116797500).

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

1909718712916 is a wasteful number, since it uses less digits than its factorization.

1909718712916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538 (or 2529 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 61.

The spelling of 1909718712916 in words is "one trillion, nine hundred nine billion, seven hundred eighteen million, seven hundred twelve thousand, nine hundred sixteen".