16990745309 has 4 divisors (see below), whose sum is σ = 17066937216. Its totient is φ = 16914553404.

The previous prime is 16990745297. The next prime is 16990745327. The reversal of 16990745309 is 90354709961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90354709961 = 86813 ⋅1040797.

It is a cyclic number.

It is not a de Polignac number, because 16990745309 - 2¹² = 16990741213 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 (16990745209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38095619 + ... + 38096064.

It is an arithmetic number, because the mean of its divisors is an integer number (4266734304).

Almost surely, 2^16990745309 is an apocalyptic number.

It is an amenable number.

16990745309 is a deficient number, since it is larger than the sum of its proper divisors (76191907).

16990745309 is an equidigital number, since it uses as much as digits as its factorization.

16990745309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76191906.

The product of its (nonzero) digits is 1837080, while the sum is 53.

The spelling of 16990745309 in words is "sixteen billion, nine hundred ninety million, seven hundred forty-five thousand, three hundred nine".