138320494991 has 8 divisors (see below), whose sum is σ = 158391140640. Its totient is φ = 118327493088.

The previous prime is 138320494967. The next prime is 138320494993. The reversal of 138320494991 is 199494023831.

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

It is not a de Polignac number, because 138320494991 - 2¹⁰ = 138320493967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138320494993) 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, 19407116 + ... + 19414241.

It is an arithmetic number, because the mean of its divisors is an integer number (19798892580).

Almost surely, 2^138320494991 is an apocalyptic number.

138320494991 is a deficient number, since it is larger than the sum of its proper divisors (20070645649).

138320494991 is an equidigital number, since it uses as much as digits as its factorization.

138320494991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38821873.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 138320494991 in words is "one hundred thirty-eight billion, three hundred twenty million, four hundred ninety-four thousand, nine hundred ninety-one".