18386788778448 has 80 divisors (see below), whose sum is σ = 48002390299200. Its totient is φ = 6064085606400.

The previous prime is 18386788778447. The next prime is 18386788778461. The reversal of 18386788778448 is 84487788768381.

It is a super-2 number, since 2×18386788778448² (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 (18386788778443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5773488 + ... + 8372976.

It is an arithmetic number, because the mean of its divisors is an integer number (600029878740).

Almost surely, 2^{18386788778448} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18386788778448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24001195149600).

18386788778448 is an abundant number, since it is smaller than the sum of its proper divisors (29615601520752).

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

18386788778448 is a wasteful number, since it uses less digits than its factorization.

18386788778448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601060 (or 2601054 counting only the distinct ones).

The product of its digits is 25895632896, while the sum is 87.

The spelling of 18386788778448 in words is "eighteen trillion, three hundred eighty-six billion, seven hundred eighty-eight million, seven hundred seventy-eight thousand, four hundred forty-eight".