16688742671 has 4 divisors (see below), whose sum is σ = 16689003000. Its totient is φ = 16688482344.

The previous prime is 16688742667. The next prime is 16688742677. The reversal of 16688742671 is 17624788661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16688742671 - 2² = 16688742667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16688742677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41180 + ... + 187278.

It is an arithmetic number, because the mean of its divisors is an integer number (4172250750).

Almost surely, 2^16688742671 is an apocalyptic number.

16688742671 is a deficient number, since it is larger than the sum of its proper divisors (260329).

16688742671 is a wasteful number, since it uses less digits than its factorization.

16688742671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260328.

The product of its digits is 5419008, while the sum is 56.

The spelling of 16688742671 in words is "sixteen billion, six hundred eighty-eight million, seven hundred forty-two thousand, six hundred seventy-one".