138503577816 has 48 divisors (see below), whose sum is σ = 381263276160. Its totient is φ = 45411007680.

The previous prime is 138503577803. The next prime is 138503577857. The reversal of 138503577816 is 618775305831.

138503577816 is a `hidden beast` number, since 1 + 3 + 8 + 50 + 3 + 577 + 8 + 16 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15763320 + ... + 15772103.

It is an arithmetic number, because the mean of its divisors is an integer number (7942984920).

Almost surely, 2^138503577816 is an apocalyptic number.

It is an amenable number.

138503577816 is an abundant number, since it is smaller than the sum of its proper divisors (242759698344).

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

138503577816 is a wasteful number, since it uses less digits than its factorization.

138503577816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31535496 (or 31535489 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 138503577816 in words is "one hundred thirty-eight billion, five hundred three million, five hundred seventy-seven thousand, eight hundred sixteen".