138216785722 has 16 divisors (see below), whose sum is σ = 213098054400. Its totient is φ = 67198515552.

The previous prime is 138216785717. The next prime is 138216785747. The reversal of 138216785722 is 227587612831.

It is a happy number.

It is a super-2 number, since 2×138216785722² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138216785722.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3584347 + ... + 3622702.

It is an arithmetic number, because the mean of its divisors is an integer number (13318628400).

Almost surely, 2^138216785722 is an apocalyptic number.

138216785722 is a deficient number, since it is larger than the sum of its proper divisors (74881268678).

138216785722 is a wasteful number, since it uses less digits than its factorization.

138216785722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7207317.

The product of its digits is 2257920, while the sum is 52.

The spelling of 138216785722 in words is "one hundred thirty-eight billion, two hundred sixteen million, seven hundred eighty-five thousand, seven hundred twenty-two".