18179655881 has 8 divisors (see below), whose sum is σ = 18638025000. Its totient is φ = 17721999360.

The previous prime is 18179655863. The next prime is 18179655953. The reversal of 18179655881 is 18855697181.

It can be written as a sum of positive squares in 4 ways, for example, as 559748281 + 17619907600 = 23659^2 + 132740^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18179655881 is a prime.

It is a super-2 number, since 2×18179655881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18179655881.

It is not an unprimeable number, because it can be changed into a prime (18179655821) 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 7 ways as a sum of consecutive naturals, for example, 126296 + ... + 228713.

It is an arithmetic number, because the mean of its divisors is an integer number (2329753125).

Almost surely, 2^18179655881 is an apocalyptic number.

It is an amenable number.

18179655881 is a deficient number, since it is larger than the sum of its proper divisors (458369119).

18179655881 is a wasteful number, since it uses less digits than its factorization.

18179655881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356299.

The product of its digits is 4838400, while the sum is 59.

The spelling of 18179655881 in words is "eighteen billion, one hundred seventy-nine million, six hundred fifty-five thousand, eight hundred eighty-one".