138652661505 has 8 divisors (see below), whose sum is σ = 221844258432. Its totient is φ = 73948086128.

The previous prime is 138652661489. The next prime is 138652661573. The reversal of 138652661505 is 505166256831.

It is a happy number.

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 138652661505 - 2⁴ = 138652661489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4621755369 + ... + 4621755398.

It is an arithmetic number, because the mean of its divisors is an integer number (27730532304).

Almost surely, 2^138652661505 is an apocalyptic number.

138652661505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138652661505 is a deficient number, since it is larger than the sum of its proper divisors (83191596927).

138652661505 is an equidigital number, since it uses as much as digits as its factorization.

138652661505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9243510775.

The product of its (nonzero) digits is 1296000, while the sum is 48.

The spelling of 138652661505 in words is "one hundred thirty-eight billion, six hundred fifty-two million, six hundred sixty-one thousand, five hundred five".