16556342317 has 2 divisors, whose sum is σ = 16556342318. Its totient is φ = 16556342316.

The previous prime is 16556342311. The next prime is 16556342321. The reversal of 16556342317 is 71324365561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16377344676 + 178997641 = 127974^2 + 13379^2 .

It is a cyclic number.

It is not a de Polignac number, because 16556342317 - 2³¹ = 14408858669 is a prime.

It is a super-2 number, since 2×16556342317² (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 (16556342311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278171158 + 8278171159.

It is an arithmetic number, because the mean of its divisors is an integer number (8278171159).

Almost surely, 2^16556342317 is an apocalyptic number.

It is an amenable number.

16556342317 is a deficient number, since it is larger than the sum of its proper divisors (1).

16556342317 is an equidigital number, since it uses as much as digits as its factorization.

16556342317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 43.

The spelling of 16556342317 in words is "sixteen billion, five hundred fifty-six million, three hundred forty-two thousand, three hundred seventeen".