139661336388 has 144 divisors (see below), whose sum is σ = 393618476160. Its totient is φ = 37749708288.

The previous prime is 139661336329. The next prime is 139661336443. The reversal of 139661336388 is 883633166931.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24529270 + ... + 24534962.

It is an arithmetic number, because the mean of its divisors is an integer number (2733461640).

Almost surely, 2^139661336388 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 139661336388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196809238080).

139661336388 is an abundant number, since it is smaller than the sum of its proper divisors (253957139772).

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

139661336388 is a wasteful number, since it uses less digits than its factorization.

139661336388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6554 (or 6533 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 57.

The spelling of 139661336388 in words is "one hundred thirty-nine billion, six hundred sixty-one million, three hundred thirty-six thousand, three hundred eighty-eight".