664125073 has 2 divisors, whose sum is σ = 664125074. Its totient is φ = 664125072.

The previous prime is 664125053. The next prime is 664125079. The reversal of 664125073 is 370521466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 556629649 + 107495424 = 23593^2 + 10368^2 .

It is a cyclic number.

It is not a de Polignac number, because 664125073 - 2⁹ = 664124561 is a prime.

It is a super-2 number, since 2×664125073² = 882124225174510658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (664125079) 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, 332062536 + 332062537.

It is an arithmetic number, because the mean of its divisors is an integer number (332062537).

Almost surely, 2^664125073 is an apocalyptic number.

It is an amenable number.

664125073 is a deficient number, since it is larger than the sum of its proper divisors (1).

664125073 is an equidigital number, since it uses as much as digits as its factorization.

664125073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 664125073 is about 25770.6242260447. The cubic root of 664125073 is about 872.4689076859.

The spelling of 664125073 in words is "six hundred sixty-four million, one hundred twenty-five thousand, seventy-three".