138669728766 has 32 divisors (see below), whose sum is σ = 290769308928. Its totient is φ = 44003984640.

The previous prime is 138669728761. The next prime is 138669728777. The reversal of 138669728766 is 667827966831.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a self number, because there is not a number n which added to its sum of digits gives 138669728766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138669728761) 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, 2352051 + ... + 2410286.

It is an arithmetic number, because the mean of its divisors is an integer number (9086540904).

Almost surely, 2^138669728766 is an apocalyptic number.

138669728766 is an abundant number, since it is smaller than the sum of its proper divisors (152099580162).

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

138669728766 is a wasteful number, since it uses less digits than its factorization.

138669728766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4762576.

The product of its digits is 219469824, while the sum is 69.

The spelling of 138669728766 in words is "one hundred thirty-eight billion, six hundred sixty-nine million, seven hundred twenty-eight thousand, seven hundred sixty-six".