72138274185 has 16 divisors (see below), whose sum is σ = 115735746816. Its totient is φ = 38368910208.

The previous prime is 72138274183. The next prime is 72138274277. The reversal of 72138274185 is 58147283127.

It is not a de Polignac number, because 72138274185 - 2¹ = 72138274183 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72138274183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6546564 + ... + 6557573.

It is an arithmetic number, because the mean of its divisors is an integer number (7233484176).

Almost surely, 2^72138274185 is an apocalyptic number.

It is an amenable number.

72138274185 is a deficient number, since it is larger than the sum of its proper divisors (43597472631).

72138274185 is a wasteful number, since it uses less digits than its factorization.

72138274185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13104512.

The product of its digits is 752640, while the sum is 48.

The spelling of 72138274185 in words is "seventy-two billion, one hundred thirty-eight million, two hundred seventy-four thousand, one hundred eighty-five".