16556425393 has 2 divisors, whose sum is σ = 16556425394. Its totient is φ = 16556425392.

The previous prime is 16556425337. The next prime is 16556425411. The reversal of 16556425393 is 39352465561.

16556425393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16116810304 + 439615089 = 126952^2 + 20967^2 .

It is an emirp because it is prime and its reverse (39352465561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16556425393 is a prime.

It is not a weakly prime, because it can be changed into another prime (16556425313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278212696 + 8278212697.

It is an arithmetic number, because the mean of its divisors is an integer number (8278212697).

Almost surely, 2^16556425393 is an apocalyptic number.

It is an amenable number.

16556425393 is a deficient number, since it is larger than the sum of its proper divisors (1).

16556425393 is an equidigital number, since it uses as much as digits as its factorization.

16556425393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916000, while the sum is 49.

The spelling of 16556425393 in words is "sixteen billion, five hundred fifty-six million, four hundred twenty-five thousand, three hundred ninety-three".