16556016230399 has 2 divisors, whose sum is σ = 16556016230400. Its totient is φ = 16556016230398.

The previous prime is 16556016230363. The next prime is 16556016230417. The reversal of 16556016230399 is 99303261065561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16556016230399 - 2¹² = 16556016226303 is a prime.

It is a super-2 number, since 2×16556016230399² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16556016230599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278008115199 + 8278008115200.

It is an arithmetic number, because the mean of its divisors is an integer number (8278008115200).

Almost surely, 2^{16556016230399} is an apocalyptic number.

16556016230399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16556016230399 is an equidigital number, since it uses as much as digits as its factorization.

16556016230399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7873200, while the sum is 56.

The spelling of 16556016230399 in words is "sixteen trillion, five hundred fifty-six billion, sixteen million, two hundred thirty thousand, three hundred ninety-nine".