16656065389 has 2 divisors, whose sum is σ = 16656065390. Its totient is φ = 16656065388.

The previous prime is 16656065383. The next prime is 16656065429. The reversal of 16656065389 is 98356065661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15703849225 + 952216164 = 125315^2 + 30858^2 .

It is a cyclic number.

It is not a de Polignac number, because 16656065389 - 2⁹ = 16656064877 is a prime.

It is a super-4 number, since 4×16656065389⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16656065383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8328032694 + 8328032695.

It is an arithmetic number, because the mean of its divisors is an integer number (8328032695).

Almost surely, 2^16656065389 is an apocalyptic number.

It is an amenable number.

16656065389 is a deficient number, since it is larger than the sum of its proper divisors (1).

16656065389 is an equidigital number, since it uses as much as digits as its factorization.

16656065389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 16656065389 in words is "sixteen billion, six hundred fifty-six million, sixty-five thousand, three hundred eighty-nine".