18820419065 has 12 divisors (see below), whose sum is σ = 26271768996. Its totient is φ = 12905430048.

The previous prime is 18820419061. The next prime is 18820419067. The reversal of 18820419065 is 56091402881.

It can be written as a sum of positive squares in 2 ways, for example, as 1888423936 + 16931995129 = 43456^2 + 130123^2 .

It is not a de Polignac number, because 18820419065 - 2² = 18820419061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18820419061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38408774 + ... + 38409263.

It is an arithmetic number, because the mean of its divisors is an integer number (2189314083).

Almost surely, 2^18820419065 is an apocalyptic number.

It is an amenable number.

18820419065 is a deficient number, since it is larger than the sum of its proper divisors (7451349931).

18820419065 is an equidigital number, since it uses as much as digits as its factorization.

18820419065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76818056 (or 76818049 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 18820419065 in words is "eighteen billion, eight hundred twenty million, four hundred nineteen thousand, sixty-five".