138851827217 has 4 divisors (see below), whose sum is σ = 139342470000. Its totient is φ = 138361184436.

The previous prime is 138851827201. The next prime is 138851827229. The reversal of 138851827217 is 712728158831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138851827217 - 2⁴ = 138851827201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138851827277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245320967 + ... + 245321532.

It is an arithmetic number, because the mean of its divisors is an integer number (34835617500).

Almost surely, 2^138851827217 is an apocalyptic number.

It is an amenable number.

138851827217 is a deficient number, since it is larger than the sum of its proper divisors (490642783).

138851827217 is an equidigital number, since it uses as much as digits as its factorization.

138851827217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490642782.

The product of its digits is 1505280, while the sum is 53.

The spelling of 138851827217 in words is "one hundred thirty-eight billion, eight hundred fifty-one million, eight hundred twenty-seven thousand, two hundred seventeen".