138892066236 has 648 divisors, whose sum is σ = 472920367920. Its totient is φ = 34200714240.

The previous prime is 138892066169. The next prime is 138892066237. The reversal of 138892066236 is 632660298831.

138892066236 is a `hidden beast` number, since 1 + 3 + 8 + 8 + 9 + 2 + 0 + 6 + 623 + 6 = 666.

It is a super-2 number, since 2×138892066236² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138892066237) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 339589200 + ... + 339589608.

Almost surely, 2^138892066236 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 138892066236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236460183960).

138892066236 is an abundant number, since it is smaller than the sum of its proper divisors (334028301684).

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

138892066236 is a wasteful number, since it uses less digits than its factorization.

138892066236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The spelling of 138892066236 in words is "one hundred thirty-eight billion, eight hundred ninety-two million, sixty-six thousand, two hundred thirty-six".