16216989517 has 2 divisors, whose sum is σ = 16216989518. Its totient is φ = 16216989516.

The previous prime is 16216989433. The next prime is 16216989541. The reversal of 16216989517 is 71598961261.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12493427076 + 3723562441 = 111774^2 + 61021^2 .

It is a cyclic number.

It is not a de Polignac number, because 16216989517 - 2¹⁹ = 16216465229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16216989577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8108494758 + 8108494759.

It is an arithmetic number, because the mean of its divisors is an integer number (8108494759).

Almost surely, 2^16216989517 is an apocalyptic number.

It is an amenable number.

16216989517 is a deficient number, since it is larger than the sum of its proper divisors (1).

16216989517 is an equidigital number, since it uses as much as digits as its factorization.

16216989517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 55.

The spelling of 16216989517 in words is "sixteen billion, two hundred sixteen million, nine hundred eighty-nine thousand, five hundred seventeen".