18442765793 has 4 divisors (see below), whose sum is σ = 18443315460. Its totient is φ = 18442216128.

The previous prime is 18442765727. The next prime is 18442765813. The reversal of 18442765793 is 39756724481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4582883809 + 13859881984 = 67697^2 + 117728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18442765793 is a prime.

It is a super-2 number, since 2×18442765793² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18442765493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220988 + ... + 292781.

It is an arithmetic number, because the mean of its divisors is an integer number (4610828865).

Almost surely, 2^18442765793 is an apocalyptic number.

It is an amenable number.

18442765793 is a deficient number, since it is larger than the sum of its proper divisors (549667).

18442765793 is an equidigital number, since it uses as much as digits as its factorization.

18442765793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549666.

The product of its digits is 10160640, while the sum is 56.

The spelling of 18442765793 in words is "eighteen billion, four hundred forty-two million, seven hundred sixty-five thousand, seven hundred ninety-three".