263889013849 has 2 divisors, whose sum is σ = 263889013850. Its totient is φ = 263889013848.

The previous prime is 263889013807. The next prime is 263889013853. The reversal of 263889013849 is 948310988362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260666408025 + 3222605824 = 510555^2 + 56768^2 .

It is a cyclic number.

It is not a de Polignac number, because 263889013849 - 2³⁷ = 126450060377 is a prime.

It is not a weakly prime, because it can be changed into another prime (263889013049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131944506924 + 131944506925.

It is an arithmetic number, because the mean of its divisors is an integer number (131944506925).

Almost surely, 2^263889013849 is an apocalyptic number.

It is an amenable number.

263889013849 is a deficient number, since it is larger than the sum of its proper divisors (1).

263889013849 is an equidigital number, since it uses as much as digits as its factorization.

263889013849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17915904, while the sum is 61.

The spelling of 263889013849 in words is "two hundred sixty-three billion, eight hundred eighty-nine million, thirteen thousand, eight hundred forty-nine".