663941393 has 2 divisors, whose sum is σ = 663941394. Its totient is φ = 663941392.

The previous prime is 663941387. The next prime is 663941401. The reversal of 663941393 is 393149366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369715984 + 294225409 = 19228^2 + 17153^2 .

It is a cyclic number.

It is not a de Polignac number, because 663941393 - 2⁶ = 663941329 is a prime.

It is not a weakly prime, because it can be changed into another prime (663941363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331970696 + 331970697.

It is an arithmetic number, because the mean of its divisors is an integer number (331970697).

Almost surely, 2^663941393 is an apocalyptic number.

It is an amenable number.

663941393 is a deficient number, since it is larger than the sum of its proper divisors (1).

663941393 is an equidigital number, since it uses as much as digits as its factorization.

663941393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 44.

The square root of 663941393 is about 25767.0602320094. The cubic root of 663941393 is about 872.3884660783.

The spelling of 663941393 in words is "six hundred sixty-three million, nine hundred forty-one thousand, three hundred ninety-three".