201864556013 has 2 divisors, whose sum is σ = 201864556014. Its totient is φ = 201864556012.

The previous prime is 201864555943. The next prime is 201864556051. The reversal of 201864556013 is 310655468102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180575703364 + 21288852649 = 424942^2 + 145907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201864556013 is a prime.

It is a super-2 number, since 2×201864556013² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201864556093) 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, 100932278006 + 100932278007.

It is an arithmetic number, because the mean of its divisors is an integer number (100932278007).

Almost surely, 2^201864556013 is an apocalyptic number.

It is an amenable number.

201864556013 is a deficient number, since it is larger than the sum of its proper divisors (1).

201864556013 is an equidigital number, since it uses as much as digits as its factorization.

201864556013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 201864556013 in words is "two hundred one billion, eight hundred sixty-four million, five hundred fifty-six thousand, thirteen".