18195681111552 has 180 divisors, whose sum is σ = 61087677455376. Its totient is φ = 5198765967360.

The previous prime is 18195681111529. The next prime is 18195681111557. The reversal of 18195681111552 is 25511118659181.

18195681111552 is a `hidden beast` number, since 1 + 8 + 1 + 9 + 5 + 6 + 81 + 1 + 1 + 1 + 552 = 666.

It is a super-2 number, since 2×18195681111552² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18195681111557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40067224 + ... + 40518807.

Almost surely, 2^{18195681111552} is an apocalyptic number.

18195681111552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18195681111552 is an abundant number, since it is smaller than the sum of its proper divisors (42891996343824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18195681111552 is an equidigital number, since it uses as much as digits as its factorization.

18195681111552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80586069 (or 80586043 counting only the distinct ones).

The product of its digits is 864000, while the sum is 54.

The spelling of 18195681111552 in words is "eighteen trillion, one hundred ninety-five billion, six hundred eighty-one million, one hundred eleven thousand, five hundred fifty-two".