16620719317 has 2 divisors, whose sum is σ = 16620719318. Its totient is φ = 16620719316.

The previous prime is 16620719293. The next prime is 16620719327. The reversal of 16620719317 is 71391702661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14441790276 + 2178929041 = 120174^2 + 46679^2 .

It is a cyclic number.

It is not a de Polignac number, because 16620719317 - 2¹⁹ = 16620195029 is a prime.

It is a super-2 number, since 2×16620719317² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16620719327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310359658 + 8310359659.

It is an arithmetic number, because the mean of its divisors is an integer number (8310359659).

Almost surely, 2^16620719317 is an apocalyptic number.

It is an amenable number.

16620719317 is a deficient number, since it is larger than the sum of its proper divisors (1).

16620719317 is an equidigital number, since it uses as much as digits as its factorization.

16620719317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The spelling of 16620719317 in words is "sixteen billion, six hundred twenty million, seven hundred nineteen thousand, three hundred seventeen".