263889013897 has 2 divisors, whose sum is σ = 263889013898. Its totient is φ = 263889013896.

The previous prime is 263889013867. The next prime is 263889013919. The reversal of 263889013897 is 798310988362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202257972361 + 61631041536 = 449731^2 + 248256^2 .

It is a cyclic number.

It is not a de Polignac number, because 263889013897 - 2³¹ = 261741530249 is a prime.

It is not a weakly prime, because it can be changed into another prime (263889013807) 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, 131944506948 + 131944506949.

It is an arithmetic number, because the mean of its divisors is an integer number (131944506949).

Almost surely, 2^263889013897 is an apocalyptic number.

It is an amenable number.

263889013897 is a deficient number, since it is larger than the sum of its proper divisors (1).

263889013897 is an equidigital number, since it uses as much as digits as its factorization.

263889013897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31352832, while the sum is 64.

The spelling of 263889013897 in words is "two hundred sixty-three billion, eight hundred eighty-nine million, thirteen thousand, eight hundred ninety-seven".