18963934321 has 2 divisors, whose sum is σ = 18963934322. Its totient is φ = 18963934320.

The previous prime is 18963934313. The next prime is 18963934351. The reversal of 18963934321 is 12343936981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17912877921 + 1051056400 = 133839^2 + 32420^2 .

It is a cyclic number.

It is not a de Polignac number, because 18963934321 - 2³ = 18963934313 is a prime.

It is not a weakly prime, because it can be changed into another prime (18963934351) 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, 9481967160 + 9481967161.

It is an arithmetic number, because the mean of its divisors is an integer number (9481967161).

Almost surely, 2^18963934321 is an apocalyptic number.

It is an amenable number.

18963934321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18963934321 is an equidigital number, since it uses as much as digits as its factorization.

18963934321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 49.

The spelling of 18963934321 in words is "eighteen billion, nine hundred sixty-three million, nine hundred thirty-four thousand, three hundred twenty-one".