16690208671 has 4 divisors (see below), whose sum is σ = 16690539712. Its totient is φ = 16689877632.

The previous prime is 16690208669. The next prime is 16690208723. The reversal of 16690208671 is 17680209661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17680209661 = 17 ⋅1040012333.

It is a cyclic number.

It is not a de Polignac number, because 16690208671 - 2¹ = 16690208669 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 (16690202671) 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, 72450 + ... + 196543.

It is an arithmetic number, because the mean of its divisors is an integer number (4172634928).

Almost surely, 2^16690208671 is an apocalyptic number.

16690208671 is a deficient number, since it is larger than the sum of its proper divisors (331041).

16690208671 is an equidigital number, since it uses as much as digits as its factorization.

16690208671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331040.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 16690208671 in words is "sixteen billion, six hundred ninety million, two hundred eight thousand, six hundred seventy-one".