18056687778 has 16 divisors (see below), whose sum is σ = 40125972960. Its totient is φ = 6018895908.

The previous prime is 18056687777. The next prime is 18056687783. The reversal of 18056687778 is 87778665081.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167191500 + ... + 167191607.

It is an arithmetic number, because the mean of its divisors is an integer number (2507873310).

Almost surely, 2^18056687778 is an apocalyptic number.

18056687778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18056687778 is an abundant number, since it is smaller than the sum of its proper divisors (22069285182).

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

18056687778 is a wasteful number, since it uses less digits than its factorization.

18056687778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334383118 (or 334383112 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

The spelling of 18056687778 in words is "eighteen billion, fifty-six million, six hundred eighty-seven thousand, seven hundred seventy-eight".