18244327643 has 2 divisors, whose sum is σ = 18244327644. Its totient is φ = 18244327642.

The previous prime is 18244327603. The next prime is 18244327667. The reversal of 18244327643 is 34672344281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18244327643 - 2⁶ = 18244327579 is a prime.

It is a super-2 number, since 2×18244327643² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18244327594 and 18244327603.

It is not a weakly prime, because it can be changed into another prime (18244327603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9122163821 + 9122163822.

It is an arithmetic number, because the mean of its divisors is an integer number (9122163822).

Almost surely, 2^18244327643 is an apocalyptic number.

18244327643 is a deficient number, since it is larger than the sum of its proper divisors (1).

18244327643 is an equidigital number, since it uses as much as digits as its factorization.

18244327643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 44.

The spelling of 18244327643 in words is "eighteen billion, two hundred forty-four million, three hundred twenty-seven thousand, six hundred forty-three".