16764635521 has 2 divisors, whose sum is σ = 16764635522. Its totient is φ = 16764635520.

The previous prime is 16764635479. The next prime is 16764635543. The reversal of 16764635521 is 12553646761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16547220496 + 217415025 = 128636^2 + 14745^2 .

It is a cyclic number.

It is not a de Polignac number, because 16764635521 - 2¹⁵ = 16764602753 is a prime.

It is not a weakly prime, because it can be changed into another prime (16764435521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8382317760 + 8382317761.

It is an arithmetic number, because the mean of its divisors is an integer number (8382317761).

Almost surely, 2^16764635521 is an apocalyptic number.

It is an amenable number.

16764635521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16764635521 is an equidigital number, since it uses as much as digits as its factorization.

16764635521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 46.

The spelling of 16764635521 in words is "sixteen billion, seven hundred sixty-four million, six hundred thirty-five thousand, five hundred twenty-one".