72138274171 has 4 divisors (see below), whose sum is σ = 72226141344. Its totient is φ = 72050407000.

The previous prime is 72138274133. The next prime is 72138274177. The reversal of 72138274171 is 17147283127.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72138274171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72138274177) 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, 43932355 + ... + 43933996.

It is an arithmetic number, because the mean of its divisors is an integer number (18056535336).

Almost surely, 2^72138274171 is an apocalyptic number.

72138274171 is a deficient number, since it is larger than the sum of its proper divisors (87867173).

72138274171 is an equidigital number, since it uses as much as digits as its factorization.

72138274171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87867172.

The product of its digits is 131712, while the sum is 43.

The spelling of 72138274171 in words is "seventy-two billion, one hundred thirty-eight million, two hundred seventy-four thousand, one hundred seventy-one".