664028129 has 2 divisors, whose sum is σ = 664028130. Its totient is φ = 664028128.

The previous prime is 664028111. The next prime is 664028161. The reversal of 664028129 is 921820466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 648211600 + 15816529 = 25460^2 + 3977^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664028129 is a prime.

It is a super-2 number, since 2×664028129² = 881866712206481282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664028092 and 664028101.

It is not a weakly prime, because it can be changed into another prime (664028329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332014064 + 332014065.

It is an arithmetic number, because the mean of its divisors is an integer number (332014065).

Almost surely, 2^664028129 is an apocalyptic number.

It is an amenable number.

664028129 is a deficient number, since it is larger than the sum of its proper divisors (1).

664028129 is an equidigital number, since it uses as much as digits as its factorization.

664028129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 664028129 is about 25768.7432561233. The cubic root of 664028129 is about 872.4264534630.

The spelling of 664028129 in words is "six hundred sixty-four million, twenty-eight thousand, one hundred twenty-nine".