16501968643 has 2 divisors, whose sum is σ = 16501968644. Its totient is φ = 16501968642.

The previous prime is 16501968611. The next prime is 16501968649. The reversal of 16501968643 is 34686910561.

16501968643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16501968643 - 2⁵ = 16501968611 is a prime.

It is a super-2 number, since 2×16501968643² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16501968649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8250984321 + 8250984322.

It is an arithmetic number, because the mean of its divisors is an integer number (8250984322).

Almost surely, 2^16501968643 is an apocalyptic number.

16501968643 is a deficient number, since it is larger than the sum of its proper divisors (1).

16501968643 is an equidigital number, since it uses as much as digits as its factorization.

16501968643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 16501968643 in words is "sixteen billion, five hundred one million, nine hundred sixty-eight thousand, six hundred forty-three".