263765138389 has 2 divisors, whose sum is σ = 263765138390. Its totient is φ = 263765138388.

The previous prime is 263765138363. The next prime is 263765138393. The reversal of 263765138389 is 983831567362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208795991364 + 54969147025 = 456942^2 + 234455^2 .

It is a cyclic number.

It is not a de Polignac number, because 263765138389 - 2⁷ = 263765138261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263765108389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131882569194 + 131882569195.

It is an arithmetic number, because the mean of its divisors is an integer number (131882569195).

Almost surely, 2^263765138389 is an apocalyptic number.

It is an amenable number.

263765138389 is a deficient number, since it is larger than the sum of its proper divisors (1).

263765138389 is an equidigital number, since it uses as much as digits as its factorization.

263765138389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39191040, while the sum is 61.

The spelling of 263765138389 in words is "two hundred sixty-three billion, seven hundred sixty-five million, one hundred thirty-eight thousand, three hundred eighty-nine".