16720516429 has 2 divisors, whose sum is σ = 16720516430. Its totient is φ = 16720516428.

The previous prime is 16720516427. The next prime is 16720516459. The reversal of 16720516429 is 92461502761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15683805225 + 1036711204 = 125235^2 + 32198^2 .

It is an emirp because it is prime and its reverse (92461502761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16720516429 - 2¹ = 16720516427 is a prime.

Together with 16720516427, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16720516427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360258214 + 8360258215.

It is an arithmetic number, because the mean of its divisors is an integer number (8360258215).

Almost surely, 2^16720516429 is an apocalyptic number.

It is an amenable number.

16720516429 is a deficient number, since it is larger than the sum of its proper divisors (1).

16720516429 is an equidigital number, since it uses as much as digits as its factorization.

16720516429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 16720516429 in words is "sixteen billion, seven hundred twenty million, five hundred sixteen thousand, four hundred twenty-nine".