16604773951813 has 2 divisors, whose sum is σ = 16604773951814. Its totient is φ = 16604773951812.

The previous prime is 16604773951771. The next prime is 16604773951817. The reversal of 16604773951813 is 31815937740661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12796023585409 + 3808750366404 = 3577153^2 + 1951602^2 .

It is a cyclic number.

It is not a de Polignac number, because 16604773951813 - 2²¹ = 16604771854661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16604773951817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8302386975906 + 8302386975907.

It is an arithmetic number, because the mean of its divisors is an integer number (8302386975907).

Almost surely, 2^{16604773951813} is an apocalyptic number.

It is an amenable number.

16604773951813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16604773951813 is an equidigital number, since it uses as much as digits as its factorization.

16604773951813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22861440, while the sum is 61.

The spelling of 16604773951813 in words is "sixteen trillion, six hundred four billion, seven hundred seventy-three million, nine hundred fifty-one thousand, eight hundred thirteen".