18895220573265 has 56 divisors (see below), whose sum is σ = 34168414451688. Its totient is φ = 10026296017920.

The previous prime is 18895220573209. The next prime is 18895220573353. The reversal of 18895220573265 is 56237502259881.

It is a happy number.

18895220573265 is a `hidden beast` number, since 1 + 8 + 8 + 9 + 52 + 2 + 0 + 573 + 2 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12727512894096 + 6167707679169 = 3567564^2 + 2483487^2 .

It is not a de Polignac number, because 18895220573265 - 2¹¹ = 18895220571217 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 55 ways as a sum of consecutive naturals, for example, 12438976 + ... + 13875105.

Almost surely, 2^{18895220573265} is an apocalyptic number.

18895220573265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18895220573265 is a deficient number, since it is larger than the sum of its proper divisors (15273193878423).

18895220573265 is an equidigital number, since it uses as much as digits as its factorization.

18895220573265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26314301 (or 26314286 counting only the distinct ones).

The product of its (nonzero) digits is 72576000, while the sum is 63.

The spelling of 18895220573265 in words is "eighteen trillion, eight hundred ninety-five billion, two hundred twenty million, five hundred seventy-three thousand, two hundred sixty-five".