16988650404689 has 2 divisors, whose sum is σ = 16988650404690. Its totient is φ = 16988650404688.

The previous prime is 16988650404659. The next prime is 16988650404703. The reversal of 16988650404689 is 98640405688961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16987751424400 + 898980289 = 4121620^2 + 29983^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16988650404689 is a prime.

It is a super-2 number, since 2×16988650404689² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16988650404619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8494325202344 + 8494325202345.

It is an arithmetic number, because the mean of its divisors is an integer number (8494325202345).

Almost surely, 2^{16988650404689} is an apocalyptic number.

It is an amenable number.

16988650404689 is a deficient number, since it is larger than the sum of its proper divisors (1).

16988650404689 is an equidigital number, since it uses as much as digits as its factorization.

16988650404689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 716636160, while the sum is 74.

The spelling of 16988650404689 in words is "sixteen trillion, nine hundred eighty-eight billion, six hundred fifty million, four hundred four thousand, six hundred eighty-nine".