16709626685 has 4 divisors (see below), whose sum is σ = 20051552028. Its totient is φ = 13367701344.

The previous prime is 16709626663. The next prime is 16709626699. The reversal of 16709626685 is 58662690761.

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 4150838329 + 12558788356 = 64427^2 + 112066^2 .

It is a cyclic number.

It is not a de Polignac number, because 16709626685 - 2²⁰ = 16708578109 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 16709626685.

It is a congruent number.

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, 1670962664 + ... + 1670962673.

It is an arithmetic number, because the mean of its divisors is an integer number (5012888007).

Almost surely, 2^16709626685 is an apocalyptic number.

It is an amenable number.

16709626685 is a deficient number, since it is larger than the sum of its proper divisors (3341925343).

16709626685 is an equidigital number, since it uses as much as digits as its factorization.

16709626685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341925342.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 16709626685 in words is "sixteen billion, seven hundred nine million, six hundred twenty-six thousand, six hundred eighty-five".