12686352737778 has 80 divisors (see below), whose sum is σ = 28611624919680. Its totient is φ = 4201336685664.

The previous prime is 12686352737687. The next prime is 12686352737789. The reversal of 12686352737778 is 87773725368621.

12686352737778 is a `hidden beast` number, since 1 + 2 + 6 + 8 + 63 + 527 + 37 + 7 + 7 + 8 = 666.

12686352737778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 31786476 + ... + 32183112.

It is an arithmetic number, because the mean of its divisors is an integer number (357645311496).

Almost surely, 2^{12686352737778} is an apocalyptic number.

12686352737778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12686352737778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14305812459840).

12686352737778 is an abundant number, since it is smaller than the sum of its proper divisors (15925272181902).

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

12686352737778 is a wasteful number, since it uses less digits than its factorization.

12686352737778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397933 (or 397924 counting only the distinct ones).

The product of its digits is 995742720, while the sum is 72.

The spelling of 12686352737778 in words is "twelve trillion, six hundred eighty-six billion, three hundred fifty-two million, seven hundred thirty-seven thousand, seven hundred seventy-eight".