16639697965 has 12 divisors (see below), whose sum is σ = 21947899932. Its totient is φ = 12101598080.

The previous prime is 16639697947. The next prime is 16639697993. The reversal of 16639697965 is 56979693661.

It can be written as a sum of positive squares in 2 ways, for example, as 11172278601 + 5467419364 = 105699^2 + 73942^2 .

It is a de Polignac number, because none of the positive numbers 2^k-16639697965 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 16639697965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13751212 + ... + 13752421.

It is an arithmetic number, because the mean of its divisors is an integer number (1828991661).

Almost surely, 2^16639697965 is an apocalyptic number.

It is an amenable number.

16639697965 is a deficient number, since it is larger than the sum of its proper divisors (5308201967).

16639697965 is a wasteful number, since it uses less digits than its factorization.

16639697965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27503660 (or 27503649 counting only the distinct ones).

The product of its digits is 99202320, while the sum is 67.

The spelling of 16639697965 in words is "sixteen billion, six hundred thirty-nine million, six hundred ninety-seven thousand, nine hundred sixty-five".