664610629 has 2 divisors, whose sum is σ = 664610630. Its totient is φ = 664610628.

The previous prime is 664610621. The next prime is 664610651. The reversal of 664610629 is 926016466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 357134404 + 307476225 = 18898^2 + 17535^2 .

It is a cyclic number.

It is not a de Polignac number, because 664610629 - 2³ = 664610621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664610591 and 664610600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664610621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332305314 + 332305315.

It is an arithmetic number, because the mean of its divisors is an integer number (332305315).

Almost surely, 2^664610629 is an apocalyptic number.

It is an amenable number.

664610629 is a deficient number, since it is larger than the sum of its proper divisors (1).

664610629 is an equidigital number, since it uses as much as digits as its factorization.

664610629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 664610629 is about 25780.0432311507. The cubic root of 664610629 is about 872.6814827614.

The spelling of 664610629 in words is "six hundred sixty-four million, six hundred ten thousand, six hundred twenty-nine".