138038609660 has 48 divisors (see below), whose sum is σ = 332231288256. Its totient is φ = 47193434112.

The previous prime is 138038609651. The next prime is 138038609671. The reversal of 138038609660 is 66906830831.

It is a junction number, because it is equal to n+sod(n) for n = 138038609599 and 138038609608.

It is a congruent number.

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, 1347167 + ... + 1446006.

It is an arithmetic number, because the mean of its divisors is an integer number (6921485172).

Almost surely, 2^138038609660 is an apocalyptic number.

138038609660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138038609660 is an abundant number, since it is smaller than the sum of its proper divisors (194192678596).

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

138038609660 is a wasteful number, since it uses less digits than its factorization.

138038609660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793542 (or 2793540 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 50.

The spelling of 138038609660 in words is "one hundred thirty-eight billion, thirty-eight million, six hundred nine thousand, six hundred sixty".