263673331321 has 2 divisors, whose sum is σ = 263673331322. Its totient is φ = 263673331320.

The previous prime is 263673331297. The next prime is 263673331357. The reversal of 263673331321 is 123133376362.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254722090000 + 8951241321 = 504700^2 + 94611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263673331321 is a prime.

It is not a weakly prime, because it can be changed into another prime (263673331121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131836665660 + 131836665661.

It is an arithmetic number, because the mean of its divisors is an integer number (131836665661).

Almost surely, 2^263673331321 is an apocalyptic number.

It is an amenable number.

263673331321 is a deficient number, since it is larger than the sum of its proper divisors (1).

263673331321 is an equidigital number, since it uses as much as digits as its factorization.

263673331321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 40.

The spelling of 263673331321 in words is "two hundred sixty-three billion, six hundred seventy-three million, three hundred thirty-one thousand, three hundred twenty-one".