138765493481 has 8 divisors (see below), whose sum is σ = 138908640000. Its totient is φ = 138622392720.

The previous prime is 138765493469. The next prime is 138765493507. The reversal of 138765493481 is 184394567831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138765493481 - 2¹⁸ = 138765231337 is a prime.

It is a super-2 number, since 2×138765493481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138765493481.

It is not an unprimeable number, because it can be changed into a prime (138765493441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12275570 + ... + 12286868.

It is an arithmetic number, because the mean of its divisors is an integer number (17363580000).

Almost surely, 2^138765493481 is an apocalyptic number.

It is an amenable number.

138765493481 is a deficient number, since it is larger than the sum of its proper divisors (143146519).

138765493481 is a wasteful number, since it uses less digits than its factorization.

138765493481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22879.

The product of its digits is 17418240, while the sum is 59.

The spelling of 138765493481 in words is "one hundred thirty-eight billion, seven hundred sixty-five million, four hundred ninety-three thousand, four hundred eighty-one".