18272847573821 has 4 divisors (see below), whose sum is σ = 18311975727552. Its totient is φ = 18233719420092.

The previous prime is 18272847573779. The next prime is 18272847573839. The reversal of 18272847573821 is 12837574827281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18272847573821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272847572821) 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, 19564076165 + ... + 19564077098.

It is an arithmetic number, because the mean of its divisors is an integer number (4577993931888).

Almost surely, 2^{18272847573821} is an apocalyptic number.

It is an amenable number.

18272847573821 is a deficient number, since it is larger than the sum of its proper divisors (39128153731).

18272847573821 is an equidigital number, since it uses as much as digits as its factorization.

18272847573821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39128153730.

The product of its digits is 84295680, while the sum is 65.

The spelling of 18272847573821 in words is "eighteen trillion, two hundred seventy-two billion, eight hundred forty-seven million, five hundred seventy-three thousand, eight hundred twenty-one".