18420322773599 has 4 divisors (see below), whose sum is σ = 19503871172064. Its totient is φ = 17336774375136.

The previous prime is 18420322773583. The next prime is 18420322773623. The reversal of 18420322773599 is 99537722302481.

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 18420322773599 - 2⁴ = 18420322773583 is a prime.

It is a super-2 number, since 2×18420322773599² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420372773599) 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, 541774199207 + ... + 541774199240.

It is an arithmetic number, because the mean of its divisors is an integer number (4875967793016).

Almost surely, 2^{18420322773599} is an apocalyptic number.

18420322773599 is a deficient number, since it is larger than the sum of its proper divisors (1083548398465).

18420322773599 is a wasteful number, since it uses less digits than its factorization.

18420322773599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083548398464.

The product of its (nonzero) digits is 45722880, while the sum is 62.

The spelling of 18420322773599 in words is "eighteen trillion, four hundred twenty billion, three hundred twenty-two million, seven hundred seventy-three thousand, five hundred ninety-nine".