72744243171 has 4 divisors (see below), whose sum is σ = 96992324232. Its totient is φ = 48496162112.

The previous prime is 72744243151. The next prime is 72744243211. The reversal of 72744243171 is 17134244727.

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

It is a cyclic number.

It is not a de Polignac number, because 72744243171 - 2⁵ = 72744243139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72744243151) 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, 12124040526 + ... + 12124040531.

It is an arithmetic number, because the mean of its divisors is an integer number (24248081058).

Almost surely, 2^72744243171 is an apocalyptic number.

72744243171 is a deficient number, since it is larger than the sum of its proper divisors (24248081061).

72744243171 is a wasteful number, since it uses less digits than its factorization.

72744243171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24248081060.

The product of its digits is 263424, while the sum is 42.

Adding to 72744243171 its reverse (17134244727), we get a palindrome (89878487898).

The spelling of 72744243171 in words is "seventy-two billion, seven hundred forty-four million, two hundred forty-three thousand, one hundred seventy-one".