16506053309 has 2 divisors, whose sum is σ = 16506053310. Its totient is φ = 16506053308.

The previous prime is 16506053231. The next prime is 16506053363. The reversal of 16506053309 is 90335060561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13624725625 + 2881327684 = 116725^2 + 53678^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506053309 - 2¹² = 16506049213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16506013309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253026654 + 8253026655.

It is an arithmetic number, because the mean of its divisors is an integer number (8253026655).

Almost surely, 2^16506053309 is an apocalyptic number.

It is an amenable number.

16506053309 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506053309 is an equidigital number, since it uses as much as digits as its factorization.

16506053309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 38.

The spelling of 16506053309 in words is "sixteen billion, five hundred six million, fifty-three thousand, three hundred nine".