16851693473 has 4 divisors (see below), whose sum is σ = 16863012420. Its totient is φ = 16840374528.

The previous prime is 16851693437. The next prime is 16851693511. The reversal of 16851693473 is 37439615861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12186393664 + 4665299809 = 110392^2 + 68303^2 .

It is a cyclic number.

It is not a de Polignac number, because 16851693473 - 2¹⁶ = 16851627937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16851693413) by changing a digit.

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, 5657240 + ... + 5660217.

It is an arithmetic number, because the mean of its divisors is an integer number (4215753105).

Almost surely, 2^16851693473 is an apocalyptic number.

It is an amenable number.

16851693473 is a deficient number, since it is larger than the sum of its proper divisors (11318947).

16851693473 is a wasteful number, since it uses less digits than its factorization.

16851693473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11318946.

The product of its digits is 3265920, while the sum is 53.

The spelling of 16851693473 in words is "sixteen billion, eight hundred fifty-one million, six hundred ninety-three thousand, four hundred seventy-three".