663670529 has 2 divisors, whose sum is σ = 663670530. Its totient is φ = 663670528.

The previous prime is 663670507. The next prime is 663670621. The reversal of 663670529 is 925076366.

663670529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475240000 + 188430529 = 21800^2 + 13727^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663670529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 663670529.

It is not a weakly prime, because it can be changed into another prime (663690529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331835264 + 331835265.

It is an arithmetic number, because the mean of its divisors is an integer number (331835265).

Almost surely, 2^663670529 is an apocalyptic number.

It is an amenable number.

663670529 is a deficient number, since it is larger than the sum of its proper divisors (1).

663670529 is an equidigital number, since it uses as much as digits as its factorization.

663670529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 663670529 is about 25761.8036829722. The cubic root of 663670529 is about 872.2698156608.

The spelling of 663670529 in words is "six hundred sixty-three million, six hundred seventy thousand, five hundred twenty-nine".