16856228957 has 2 divisors, whose sum is σ = 16856228958. Its totient is φ = 16856228956.

The previous prime is 16856228947. The next prime is 16856228971. The reversal of 16856228957 is 75982265861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14671507876 + 2184721081 = 121126^2 + 46741^2 .

It is a cyclic number.

It is not a de Polignac number, because 16856228957 - 2¹⁰ = 16856227933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16856228896 and 16856228905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16856228947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8428114478 + 8428114479.

It is an arithmetic number, because the mean of its divisors is an integer number (8428114479).

Almost surely, 2^16856228957 is an apocalyptic number.

It is an amenable number.

16856228957 is a deficient number, since it is larger than the sum of its proper divisors (1).

16856228957 is an equidigital number, since it uses as much as digits as its factorization.

16856228957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 59.

The spelling of 16856228957 in words is "sixteen billion, eight hundred fifty-six million, two hundred twenty-eight thousand, nine hundred fifty-seven".