663451878937 has 2 divisors, whose sum is σ = 663451878938. Its totient is φ = 663451878936.

The previous prime is 663451878893. The next prime is 663451878967. The reversal of 663451878937 is 739878154366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 485668216201 + 177783662736 = 696899^2 + 421644^2 .

It is a cyclic number.

It is not a de Polignac number, because 663451878937 - 2⁷ = 663451878809 is a prime.

It is not a weakly prime, because it can be changed into another prime (663451878967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331725939468 + 331725939469.

It is an arithmetic number, because the mean of its divisors is an integer number (331725939469).

Almost surely, 2^663451878937 is an apocalyptic number.

It is an amenable number.

663451878937 is a deficient number, since it is larger than the sum of its proper divisors (1).

663451878937 is an equidigital number, since it uses as much as digits as its factorization.

663451878937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 182891520, while the sum is 67.

The spelling of 663451878937 in words is "six hundred sixty-three billion, four hundred fifty-one million, eight hundred seventy-eight thousand, nine hundred thirty-seven".