18403536073 has 16 divisors (see below), whose sum is σ = 20287181376. Its totient is φ = 16587023040.

The previous prime is 18403536071. The next prime is 18403536083. The reversal of 18403536073 is 37063530481.

It is a cyclic number.

It is not a de Polignac number, because 18403536073 - 2¹ = 18403536071 is a prime.

It is a super-2 number, since 2×18403536073² (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 (18403536071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3058638 + ... + 3064648.

It is an arithmetic number, because the mean of its divisors is an integer number (1267948836).

Almost surely, 2^18403536073 is an apocalyptic number.

18403536073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18403536073 is a deficient number, since it is larger than the sum of its proper divisors (1883645303).

18403536073 is a wasteful number, since it uses less digits than its factorization.

18403536073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11544.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 18403536073 in words is "eighteen billion, four hundred three million, five hundred thirty-six thousand, seventy-three".