918568643 has 2 divisors, whose sum is σ = 918568644. Its totient is φ = 918568642.

The previous prime is 918568621. The next prime is 918568691. The reversal of 918568643 is 346865819.

918568643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (346865819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 918568643 - 2¹⁰ = 918567619 is a prime.

It is a super-2 number, since 2×918568643² = 1687536703805722898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 918568591 and 918568600.

It is not a weakly prime, because it can be changed into another prime (918568613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459284321 + 459284322.

It is an arithmetic number, because the mean of its divisors is an integer number (459284322).

Almost surely, 2^918568643 is an apocalyptic number.

918568643 is a deficient number, since it is larger than the sum of its proper divisors (1).

918568643 is an equidigital number, since it uses as much as digits as its factorization.

918568643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1244160, while the sum is 50.

The square root of 918568643 is about 30307.8973701575. The cubic root of 918568643 is about 972.0841724456.

The spelling of 918568643 in words is "nine hundred eighteen million, five hundred sixty-eight thousand, six hundred forty-three".