263994889013 has 2 divisors, whose sum is σ = 263994889014. Its totient is φ = 263994889012.

The previous prime is 263994889001. The next prime is 263994889033. The reversal of 263994889013 is 310988499362.

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., 219115737604 + 44879151409 = 468098^2 + 211847^2 .

It is a cyclic number.

It is not a de Polignac number, because 263994889013 - 2¹² = 263994884917 is a prime.

It is a super-2 number, since 2×263994889013² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263994889033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131997444506 + 131997444507.

It is an arithmetic number, because the mean of its divisors is an integer number (131997444507).

Almost surely, 2^263994889013 is an apocalyptic number.

It is an amenable number.

263994889013 is a deficient number, since it is larger than the sum of its proper divisors (1).

263994889013 is an equidigital number, since it uses as much as digits as its factorization.

263994889013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20155392, while the sum is 62.

The spelling of 263994889013 in words is "two hundred sixty-three billion, nine hundred ninety-four million, eight hundred eighty-nine thousand, thirteen".