16913556643 has 2 divisors, whose sum is σ = 16913556644. Its totient is φ = 16913556642.

The previous prime is 16913556641. The next prime is 16913556677. The reversal of 16913556643 is 34665531961.

It is a weak prime.

It is an emirp because it is prime and its reverse (34665531961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16913556643 - 2¹ = 16913556641 is a prime.

Together with 16913556641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16913556641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8456778321 + 8456778322.

It is an arithmetic number, because the mean of its divisors is an integer number (8456778322).

Almost surely, 2^16913556643 is an apocalyptic number.

16913556643 is a deficient number, since it is larger than the sum of its proper divisors (1).

16913556643 is an equidigital number, since it uses as much as digits as its factorization.

16913556643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 49.

The spelling of 16913556643 in words is "sixteen billion, nine hundred thirteen million, five hundred fifty-six thousand, six hundred forty-three".