18420963019 has 4 divisors (see below), whose sum is σ = 18421304400. Its totient is φ = 18420621640.

The previous prime is 18420963017. The next prime is 18420963091. The reversal of 18420963019 is 91036902481.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18420963019 - 2¹ = 18420963017 is a prime.

It is a super-2 number, since 2×18420963019² (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 (18420963017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69919 + ... + 204280.

It is an arithmetic number, because the mean of its divisors is an integer number (4605326100).

Almost surely, 2^18420963019 is an apocalyptic number.

18420963019 is a deficient number, since it is larger than the sum of its proper divisors (341381).

18420963019 is an equidigital number, since it uses as much as digits as its factorization.

18420963019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341380.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 18420963019 in words is "eighteen billion, four hundred twenty million, nine hundred sixty-three thousand, nineteen".