663239387 has 2 divisors, whose sum is σ = 663239388. Its totient is φ = 663239386.

The previous prime is 663239371. The next prime is 663239407. The reversal of 663239387 is 783932366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663239387 - 2⁴ = 663239371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668239387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331619693 + 331619694.

It is an arithmetic number, because the mean of its divisors is an integer number (331619694).

Almost surely, 2^663239387 is an apocalyptic number.

663239387 is a deficient number, since it is larger than the sum of its proper divisors (1).

663239387 is an equidigital number, since it uses as much as digits as its factorization.

663239387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 47.

The square root of 663239387 is about 25753.4344699887. The cubic root of 663239387 is about 872.0808897796.

The spelling of 663239387 in words is "six hundred sixty-three million, two hundred thirty-nine thousand, three hundred eighty-seven".