18056687779 has 8 divisors (see below), whose sum is σ = 19919948832. Its totient is φ = 16261181760.

The previous prime is 18056687777. The next prime is 18056687783. The reversal of 18056687779 is 97778665081.

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

It is a cyclic number.

It is not a de Polignac number, because 18056687779 - 2¹ = 18056687777 is a prime.

It is a super-3 number, since 3×18056687779³ (a number of 32 digits) contains 333 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 18056687779.

It is not an unprimeable number, because it can be changed into a prime (18056687771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16938199 + ... + 16939264.

It is an arithmetic number, because the mean of its divisors is an integer number (2489993604).

Almost surely, 2^18056687779 is an apocalyptic number.

18056687779 is a deficient number, since it is larger than the sum of its proper divisors (1863261053).

18056687779 is a wasteful number, since it uses less digits than its factorization.

18056687779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33877517.

The product of its (nonzero) digits is 35562240, while the sum is 64.

The spelling of 18056687779 in words is "eighteen billion, fifty-six million, six hundred eighty-seven thousand, seven hundred seventy-nine".