663929317889 has 2 divisors, whose sum is σ = 663929317890. Its totient is φ = 663929317888.

The previous prime is 663929317879. The next prime is 663929317913. The reversal of 663929317889 is 988713929366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 649663404289 + 14265913600 = 806017^2 + 119440^2 .

It is a cyclic number.

It is not a de Polignac number, because 663929317889 - 2¹² = 663929313793 is a prime.

It is not a weakly prime, because it can be changed into another prime (663929317819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331964658944 + 331964658945.

It is an arithmetic number, because the mean of its divisors is an integer number (331964658945).

Almost surely, 2^663929317889 is an apocalyptic number.

It is an amenable number.

663929317889 is a deficient number, since it is larger than the sum of its proper divisors (1).

663929317889 is an equidigital number, since it uses as much as digits as its factorization.

663929317889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211631616, while the sum is 71.

The spelling of 663929317889 in words is "six hundred sixty-three billion, nine hundred twenty-nine million, three hundred seventeen thousand, eight hundred eighty-nine".