13786777818 has 24 divisors (see below), whose sum is σ = 32586929856. Its totient is φ = 4177811400.

The previous prime is 13786777789. The next prime is 13786777841. The reversal of 13786777818 is 81877768731.

It is a super-2 number, since 2×13786777818² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34814898 + ... + 34815293.

It is an arithmetic number, because the mean of its divisors is an integer number (1357788744).

Almost surely, 2^13786777818 is an apocalyptic number.

13786777818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13786777818 is an abundant number, since it is smaller than the sum of its proper divisors (18800152038).

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

13786777818 is a wasteful number, since it uses less digits than its factorization.

13786777818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69630210 (or 69630207 counting only the distinct ones).

The product of its digits is 22127616, while the sum is 63.

The spelling of 13786777818 in words is "thirteen billion, seven hundred eighty-six million, seven hundred seventy-seven thousand, eight hundred eighteen".