16836668521 has 2 divisors, whose sum is σ = 16836668522. Its totient is φ = 16836668520.

The previous prime is 16836668507. The next prime is 16836668543. The reversal of 16836668521 is 12586663861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9319778521 + 7516890000 = 96539^2 + 86700^2 .

It is a cyclic number.

It is not a de Polignac number, because 16836668521 - 2⁵ = 16836668489 is a prime.

It is not a weakly prime, because it can be changed into another prime (16836668551) 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, 8418334260 + 8418334261.

It is an arithmetic number, because the mean of its divisors is an integer number (8418334261).

Almost surely, 2^16836668521 is an apocalyptic number.

It is an amenable number.

16836668521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16836668521 is an equidigital number, since it uses as much as digits as its factorization.

16836668521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 52.

The spelling of 16836668521 in words is "sixteen billion, eight hundred thirty-six million, six hundred sixty-eight thousand, five hundred twenty-one".