663093989 has 2 divisors, whose sum is σ = 663093990. Its totient is φ = 663093988.

The previous prime is 663093953. The next prime is 663093997. The reversal of 663093989 is 989390366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433056100 + 230037889 = 20810^2 + 15167^2 .

It is a cyclic number.

It is not a de Polignac number, because 663093989 - 2²⁰ = 662045413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 663093989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663093919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331546994 + 331546995.

It is an arithmetic number, because the mean of its divisors is an integer number (331546995).

Almost surely, 2^663093989 is an apocalyptic number.

It is an amenable number.

663093989 is a deficient number, since it is larger than the sum of its proper divisors (1).

663093989 is an equidigital number, since it uses as much as digits as its factorization.

663093989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 53.

The square root of 663093989 is about 25750.6114296341. The cubic root of 663093989 is about 872.0171580981.

The spelling of 663093989 in words is "six hundred sixty-three million, ninety-three thousand, nine hundred eighty-nine".