138135531830 has 8 divisors (see below), whose sum is σ = 248643957312. Its totient is φ = 55254212728.

The previous prime is 138135531739. The next prime is 138135531851. The reversal of 138135531830 is 38135531831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6906776582 + ... + 6906776601.

It is an arithmetic number, because the mean of its divisors is an integer number (31080494664).

Almost surely, 2^138135531830 is an apocalyptic number.

138135531830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138135531830 is a deficient number, since it is larger than the sum of its proper divisors (110508425482).

138135531830 is a wasteful number, since it uses less digits than its factorization.

138135531830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13813553190.

The product of its (nonzero) digits is 129600, while the sum is 41.

Subtracting from 138135531830 its reverse (38135531831), we obtain a palindrome (99999999999).

The spelling of 138135531830 in words is "one hundred thirty-eight billion, one hundred thirty-five million, five hundred thirty-one thousand, eight hundred thirty".