16613957309 has 2 divisors, whose sum is σ = 16613957310. Its totient is φ = 16613957308.

The previous prime is 16613957279. The next prime is 16613957341. The reversal of 16613957309 is 90375931661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9402211225 + 7211746084 = 96965^2 + 84922^2 .

It is a cyclic number.

It is not a de Polignac number, because 16613957309 - 2⁸ = 16613957053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16613957369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8306978654 + 8306978655.

It is an arithmetic number, because the mean of its divisors is an integer number (8306978655).

Almost surely, 2^16613957309 is an apocalyptic number.

It is an amenable number.

16613957309 is a deficient number, since it is larger than the sum of its proper divisors (1).

16613957309 is an equidigital number, since it uses as much as digits as its factorization.

16613957309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918540, while the sum is 50.

The spelling of 16613957309 in words is "sixteen billion, six hundred thirteen million, nine hundred fifty-seven thousand, three hundred nine".