138212474905 has 4 divisors (see below), whose sum is σ = 165854969892. Its totient is φ = 110569979920.

The previous prime is 138212474891. The next prime is 138212474951. The reversal of 138212474905 is 509474212831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21273097609 + 116939377296 = 145853^2 + 341964^2 .

It is not a de Polignac number, because 138212474905 - 2¹¹ = 138212472857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13821247486 + ... + 13821247495.

It is an arithmetic number, because the mean of its divisors is an integer number (41463742473).

Almost surely, 2^138212474905 is an apocalyptic number.

It is an amenable number.

138212474905 is a deficient number, since it is larger than the sum of its proper divisors (27642494987).

138212474905 is an equidigital number, since it uses as much as digits as its factorization.

138212474905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27642494986.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 138212474905 in words is "one hundred thirty-eight billion, two hundred twelve million, four hundred seventy-four thousand, nine hundred five".