16623221759 has 2 divisors, whose sum is σ = 16623221760. Its totient is φ = 16623221758.

The previous prime is 16623221749. The next prime is 16623221807. The reversal of 16623221759 is 95712232661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16623221759 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16623221749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8311610879 + 8311610880.

It is an arithmetic number, because the mean of its divisors is an integer number (8311610880).

Almost surely, 2^16623221759 is an apocalyptic number.

16623221759 is a deficient number, since it is larger than the sum of its proper divisors (1).

16623221759 is an equidigital number, since it uses as much as digits as its factorization.

16623221759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The spelling of 16623221759 in words is "sixteen billion, six hundred twenty-three million, two hundred twenty-one thousand, seven hundred fifty-nine".