16718870709 has 6 divisors (see below), whose sum is σ = 24149479926. Its totient is φ = 11145913800.

The previous prime is 16718870647. The next prime is 16718870719. The reversal of 16718870709 is 90707881761.

It can be written as a sum of positive squares in only one way, i.e., 13580406225 + 3138464484 = 116535^2 + 56022^2 .

It is not a de Polignac number, because 16718870709 - 2¹⁷ = 16718739637 is a prime.

It is a super-4 number, since 4×16718870709⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16718870719) 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, 928826142 + ... + 928826159.

It is an arithmetic number, because the mean of its divisors is an integer number (4024913321).

Almost surely, 2^16718870709 is an apocalyptic number.

It is an amenable number.

16718870709 is a deficient number, since it is larger than the sum of its proper divisors (7430609217).

16718870709 is a wasteful number, since it uses less digits than its factorization.

16718870709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857652307 (or 1857652304 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 54.

The spelling of 16718870709 in words is "sixteen billion, seven hundred eighteen million, eight hundred seventy thousand, seven hundred nine".