664801584173 has 2 divisors, whose sum is σ = 664801584174. Its totient is φ = 664801584172.

The previous prime is 664801584133. The next prime is 664801584191. The reversal of 664801584173 is 371485108466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478036725604 + 186764858569 = 691402^2 + 432163^2 .

It is a cyclic number.

It is not a de Polignac number, because 664801584173 - 2¹⁶ = 664801518637 is a prime.

It is a super-2 number, since 2×664801584173² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664801584133) 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, 332400792086 + 332400792087.

It is an arithmetic number, because the mean of its divisors is an integer number (332400792087).

Almost surely, 2^664801584173 is an apocalyptic number.

It is an amenable number.

664801584173 is a deficient number, since it is larger than the sum of its proper divisors (1).

664801584173 is an equidigital number, since it uses as much as digits as its factorization.

664801584173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 664801584173 in words is "six hundred sixty-four billion, eight hundred one million, five hundred eighty-four thousand, one hundred seventy-three".