138666386650 has 48 divisors (see below), whose sum is σ = 281407801248. Its totient is φ = 50416776000.

The previous prime is 138666386647. The next prime is 138666386693. The reversal of 138666386650 is 56683666831.

138666386650 is digitally balanced in base 3, 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 23 ways as a sum of consecutive naturals, for example, 4986184 + ... + 5013916.

It is an arithmetic number, because the mean of its divisors is an integer number (5862662526).

Almost surely, 2^138666386650 is an apocalyptic number.

138666386650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138666386650 is an abundant number, since it is smaller than the sum of its proper divisors (142741414598).

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

138666386650 is a wasteful number, since it uses less digits than its factorization.

138666386650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36847 (or 36842 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 58.

The spelling of 138666386650 in words is "one hundred thirty-eight billion, six hundred sixty-six million, three hundred eighty-six thousand, six hundred fifty".