647388105137173 has 2 divisors, whose sum is σ = 647388105137174. Its totient is φ = 647388105137172.

The previous prime is 647388105137149. The next prime is 647388105137177. The reversal of 647388105137173 is 371731501883746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492908511580849 + 154479593556324 = 22201543^2 + 12428982^2 .

It is a cyclic number.

It is not a de Polignac number, because 647388105137173 - 2¹³ = 647388105128981 is a prime.

It is a super-2 number, since 2×647388105137173² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647388105137177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323694052568586 + 323694052568587.

It is an arithmetic number, because the mean of its divisors is an integer number (323694052568587).

Almost surely, 2^{647388105137173} is an apocalyptic number.

It is an amenable number.

647388105137173 is a deficient number, since it is larger than the sum of its proper divisors (1).

647388105137173 is an equidigital number, since it uses as much as digits as its factorization.

647388105137173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71124480, while the sum is 64.

The spelling of 647388105137173 in words is "six hundred forty-seven trillion, three hundred eighty-eight billion, one hundred five million, one hundred thirty-seven thousand, one hundred seventy-three".