18272307573 has 12 divisors (see below), whose sum is σ = 28423589740. Its totient is φ = 11244496896.

The previous prime is 18272307551. The next prime is 18272307601. The reversal of 18272307573 is 37570327281.

It is a happy number.

18272307573 is a `hidden beast` number, since 1 + 8 + 2 + 72 + 3 + 0 + 7 + 573 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4855023684 + 13417283889 = 69678^2 + 115833^2 .

It is not a de Polignac number, because 18272307573 - 2²⁶ = 18205198709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272307073) 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, 78086668 + ... + 78086901.

Almost surely, 2^18272307573 is an apocalyptic number.

18272307573 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18272307573 is a deficient number, since it is larger than the sum of its proper divisors (10151282167).

18272307573 is a wasteful number, since it uses less digits than its factorization.

18272307573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156173588 (or 156173585 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 18272307573 in words is "eighteen billion, two hundred seventy-two million, three hundred seven thousand, five hundred seventy-three".