263989386469 has 2 divisors, whose sum is σ = 263989386470. Its totient is φ = 263989386468.

The previous prime is 263989386391. The next prime is 263989386473. The reversal of 263989386469 is 964683989362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236038562244 + 27950824225 = 485838^2 + 167185^2 .

It is a cyclic number.

It is not a de Polignac number, because 263989386469 - 2²¹ = 263987289317 is a prime.

It is a super-2 number, since 2×263989386469² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263989336469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131994693234 + 131994693235.

It is an arithmetic number, because the mean of its divisors is an integer number (131994693235).

Almost surely, 2^263989386469 is an apocalyptic number.

It is an amenable number.

263989386469 is a deficient number, since it is larger than the sum of its proper divisors (1).

263989386469 is an equidigital number, since it uses as much as digits as its factorization.

263989386469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725594112, while the sum is 73.

The spelling of 263989386469 in words is "two hundred sixty-three billion, nine hundred eighty-nine million, three hundred eighty-six thousand, four hundred sixty-nine".