16021019709 has 6 divisors (see below), whose sum is σ = 23141472926. Its totient is φ = 10680679800.

The previous prime is 16021019689. The next prime is 16021019717. The reversal of 16021019709 is 90791012061.

It can be written as a sum of positive squares in only one way, i.e., 9629496900 + 6391522809 = 98130^2 + 79947^2 .

It is not a de Polignac number, because 16021019709 - 2¹² = 16021015613 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 (16021019719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 890056642 + ... + 890056659.

Almost surely, 2^16021019709 is an apocalyptic number.

It is an amenable number.

16021019709 is a deficient number, since it is larger than the sum of its proper divisors (7120453217).

16021019709 is a wasteful number, since it uses less digits than its factorization.

16021019709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780113307 (or 1780113304 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The spelling of 16021019709 in words is "sixteen billion, twenty-one million, nineteen thousand, seven hundred nine".