18110381778 has 24 divisors (see below), whose sum is σ = 39300210768. Its totient is φ = 6027401592.

The previous prime is 18110381777. The next prime is 18110381813. The reversal of 18110381778 is 87718301181.

It is not an unprimeable number, because it can be changed into a prime (18110381777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 770800 + ... + 793947.

It is an arithmetic number, because the mean of its divisors is an integer number (1637508782).

Almost surely, 2^18110381778 is an apocalyptic number.

18110381778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18110381778 is an abundant number, since it is smaller than the sum of its proper divisors (21189828990).

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

18110381778 is a wasteful number, since it uses less digits than its factorization.

18110381778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565398 (or 1565395 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 45.

The spelling of 18110381778 in words is "eighteen billion, one hundred ten million, three hundred eighty-one thousand, seven hundred seventy-eight".