263309868643 has 2 divisors, whose sum is σ = 263309868644. Its totient is φ = 263309868642.

The previous prime is 263309868587. The next prime is 263309868649. The reversal of 263309868643 is 346868903362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263309868643 is a prime.

It is a super-2 number, since 2×263309868643² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (263309868649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131654934321 + 131654934322.

It is an arithmetic number, because the mean of its divisors is an integer number (131654934322).

Almost surely, 2^263309868643 is an apocalyptic number.

263309868643 is a deficient number, since it is larger than the sum of its proper divisors (1).

263309868643 is an equidigital number, since it uses as much as digits as its factorization.

263309868643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26873856, while the sum is 58.

The spelling of 263309868643 in words is "two hundred sixty-three billion, three hundred nine million, eight hundred sixty-eight thousand, six hundred forty-three".