16718442905 has 4 divisors (see below), whose sum is σ = 20062131492. Its totient is φ = 13374754320.

The previous prime is 16718442887. The next prime is 16718442913. The reversal of 16718442905 is 50924481761.

It is a happy number.

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 1809056089 + 14909386816 = 42533^2 + 122104^2 .

It is not a de Polignac number, because 16718442905 - 2¹⁰ = 16718441881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16718442905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1671844286 + ... + 1671844295.

It is an arithmetic number, because the mean of its divisors is an integer number (5015532873).

Almost surely, 2^16718442905 is an apocalyptic number.

It is an amenable number.

16718442905 is a deficient number, since it is larger than the sum of its proper divisors (3343688587).

16718442905 is an equidigital number, since it uses as much as digits as its factorization.

16718442905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343688586.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 16718442905 in words is "sixteen billion, seven hundred eighteen million, four hundred forty-two thousand, nine hundred five".