72144617911 has 4 divisors (see below), whose sum is σ = 72150309952. Its totient is φ = 72138925872.

The previous prime is 72144617879. The next prime is 72144617927. The reversal of 72144617911 is 11971644127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11971644127 = 19 ⋅630086533.

It is a cyclic number.

It is not a de Polignac number, because 72144617911 - 2⁵ = 72144617879 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 (72144617011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2826966 + ... + 2852371.

It is an arithmetic number, because the mean of its divisors is an integer number (18037577488).

Almost surely, 2^72144617911 is an apocalyptic number.

72144617911 is a deficient number, since it is larger than the sum of its proper divisors (5692041).

72144617911 is a wasteful number, since it uses less digits than its factorization.

72144617911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692040.

The product of its digits is 84672, while the sum is 43.

The spelling of 72144617911 in words is "seventy-two billion, one hundred forty-four million, six hundred seventeen thousand, nine hundred eleven".