16764233921 has 2 divisors, whose sum is σ = 16764233922. Its totient is φ = 16764233920.

The previous prime is 16764233917. The next prime is 16764233929. The reversal of 16764233921 is 12933246761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16074436225 + 689797696 = 126785^2 + 26264^2 .

It is a cyclic number.

It is not a de Polignac number, because 16764233921 - 2² = 16764233917 is a prime.

It is not a weakly prime, because it can be changed into another prime (16764233929) 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, 8382116960 + 8382116961.

It is an arithmetic number, because the mean of its divisors is an integer number (8382116961).

Almost surely, 2^16764233921 is an apocalyptic number.

It is an amenable number.

16764233921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16764233921 is an equidigital number, since it uses as much as digits as its factorization.

16764233921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 44.

The spelling of 16764233921 in words is "sixteen billion, seven hundred sixty-four million, two hundred thirty-three thousand, nine hundred twenty-one".