664164029 has 2 divisors, whose sum is σ = 664164030. Its totient is φ = 664164028.

The previous prime is 664163971. The next prime is 664164049. The reversal of 664164029 is 920461466.

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., 605258404 + 58905625 = 24602^2 + 7675^2 .

It is a cyclic number.

It is not a de Polignac number, because 664164029 - 2¹² = 664159933 is a prime.

It is a super-2 number, since 2×664164029² = 882227714835025682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 664163983 and 664164001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664164049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332082014 + 332082015.

It is an arithmetic number, because the mean of its divisors is an integer number (332082015).

Almost surely, 2^664164029 is an apocalyptic number.

It is an amenable number.

664164029 is a deficient number, since it is larger than the sum of its proper divisors (1).

664164029 is an equidigital number, since it uses as much as digits as its factorization.

664164029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 664164029 is about 25771.3800367772. The cubic root of 664164029 is about 872.4859663372.

The spelling of 664164029 in words is "six hundred sixty-four million, one hundred sixty-four thousand, twenty-nine".