16688782191604 has 6 divisors (see below), whose sum is σ = 29205368835314. Its totient is φ = 8344391095800.

The previous prime is 16688782191593. The next prime is 16688782191619. The reversal of 16688782191604 is 40619128788661.

It can be written as a sum of positive squares in only one way, i.e., 16599350092900 + 89432098704 = 4074230^2 + 299052^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16688782191604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2086097773947 + ... + 2086097773954.

Almost surely, 2^{16688782191604} is an apocalyptic number.

It is an amenable number.

16688782191604 is a deficient number, since it is larger than the sum of its proper divisors (12516586643710).

16688782191604 is a wasteful number, since it uses less digits than its factorization.

16688782191604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4172195547905 (or 4172195547903 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 67.

The spelling of 16688782191604 in words is "sixteen trillion, six hundred eighty-eight billion, seven hundred eighty-two million, one hundred ninety-one thousand, six hundred four".