138155078505 has 8 divisors (see below), whose sum is σ = 221048125632. Its totient is φ = 73682708528.

The previous prime is 138155078497. The next prime is 138155078507. The reversal of 138155078505 is 505870551831.

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 138155078505 - 2³ = 138155078497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138155078507) 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, 4605169269 + ... + 4605169298.

It is an arithmetic number, because the mean of its divisors is an integer number (27631015704).

Almost surely, 2^138155078505 is an apocalyptic number.

138155078505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138155078505 is a deficient number, since it is larger than the sum of its proper divisors (82893047127).

138155078505 is an equidigital number, since it uses as much as digits as its factorization.

138155078505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9210338575.

The product of its (nonzero) digits is 840000, while the sum is 48.

The spelling of 138155078505 in words is "one hundred thirty-eight billion, one hundred fifty-five million, seventy-eight thousand, five hundred five".