263989386473 has 2 divisors, whose sum is σ = 263989386474. Its totient is φ = 263989386472.

The previous prime is 263989386469. The next prime is 263989386539. The reversal of 263989386473 is 374683989362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141606958249 + 122382428224 = 376307^2 + 349832^2 .

It is a cyclic number.

It is not a de Polignac number, because 263989386473 - 2² = 263989386469 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (263989382473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131994693236 + 131994693237.

It is an arithmetic number, because the mean of its divisors is an integer number (131994693237).

Almost surely, 2^263989386473 is an apocalyptic number.

It is an amenable number.

263989386473 is a deficient number, since it is larger than the sum of its proper divisors (1).

263989386473 is an equidigital number, since it uses as much as digits as its factorization.

263989386473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282175488, while the sum is 68.

The spelling of 263989386473 in words is "two hundred sixty-three billion, nine hundred eighty-nine million, three hundred eighty-six thousand, four hundred seventy-three".