11556506016173 has 2 divisors, whose sum is σ = 11556506016174. Its totient is φ = 11556506016172.

The previous prime is 11556506016151. The next prime is 11556506016179. The reversal of 11556506016173 is 37161060565511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6960378892009 + 4596127124164 = 2638253^2 + 2143858^2 .

It is a cyclic number.

It is not a de Polignac number, because 11556506016173 - 2¹⁶ = 11556505950637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11556506016179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5778253008086 + 5778253008087.

It is an arithmetic number, because the mean of its divisors is an integer number (5778253008087).

Almost surely, 2^{11556506016173} is an apocalyptic number.

It is an amenable number.

11556506016173 is a deficient number, since it is larger than the sum of its proper divisors (1).

11556506016173 is an equidigital number, since it uses as much as digits as its factorization.

11556506016173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567000, while the sum is 47.

The spelling of 11556506016173 in words is "eleven trillion, five hundred fifty-six billion, five hundred six million, sixteen thousand, one hundred seventy-three".