16619890729009 has 2 divisors, whose sum is σ = 16619890729010. Its totient is φ = 16619890729008.

The previous prime is 16619890729007. The next prime is 16619890729031. The reversal of 16619890729009 is 90092709891661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9665277863409 + 6954612865600 = 3108903^2 + 2637160^2 .

It is an emirp because it is prime and its reverse (90092709891661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16619890729009 - 2¹ = 16619890729007 is a prime.

Together with 16619890729007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16619890729007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8309945364504 + 8309945364505.

It is an arithmetic number, because the mean of its divisors is an integer number (8309945364505).

Almost surely, 2^{16619890729009} is an apocalyptic number.

It is an amenable number.

16619890729009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16619890729009 is an equidigital number, since it uses as much as digits as its factorization.

16619890729009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26453952, while the sum is 67.

The spelling of 16619890729009 in words is "sixteen trillion, six hundred nineteen billion, eight hundred ninety million, seven hundred twenty-nine thousand, nine".