138601777552 has 80 divisors (see below), whose sum is σ = 311722048512. Its totient is φ = 58470894720.

The previous prime is 138601777513. The next prime is 138601777583. The reversal of 138601777552 is 255777106831.

It is a super-2 number, since 2×138601777552² (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 138601777552.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5099583 + ... + 5126689.

Almost surely, 2^138601777552 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 138601777552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155861024256).

138601777552 is an abundant number, since it is smaller than the sum of its proper divisors (173120270960).

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

138601777552 is a wasteful number, since it uses less digits than its factorization.

138601777552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27836 (or 27830 counting only the distinct ones).

The product of its (nonzero) digits is 2469600, while the sum is 52.

The spelling of 138601777552 in words is "one hundred thirty-eight billion, six hundred one million, seven hundred seventy-seven thousand, five hundred fifty-two".