663625013 has 2 divisors, whose sum is σ = 663625014. Its totient is φ = 663625012.

The previous prime is 663624947. The next prime is 663625019. The reversal of 663625013 is 310526366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648313444 + 15311569 = 25462^2 + 3913^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663625013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663625019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331812506 + 331812507.

It is an arithmetic number, because the mean of its divisors is an integer number (331812507).

Almost surely, 2^663625013 is an apocalyptic number.

It is an amenable number.

663625013 is a deficient number, since it is larger than the sum of its proper divisors (1).

663625013 is an equidigital number, since it uses as much as digits as its factorization.

663625013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 663625013 is about 25760.9202669470. The cubic root of 663625013 is about 872.2498744707.

The spelling of 663625013 in words is "six hundred sixty-three million, six hundred twenty-five thousand, thirteen".