72157312243 has 8 divisors (see below), whose sum is σ = 76435962768. Its totient is φ = 67882450944.

The previous prime is 72157312153. The next prime is 72157312259. The reversal of 72157312243 is 34221375127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72157312243 - 2³³ = 63567377651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72157312043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908046 + ... + 984307.

It is an arithmetic number, because the mean of its divisors is an integer number (9554495346).

Almost surely, 2^72157312243 is an apocalyptic number.

72157312243 is a deficient number, since it is larger than the sum of its proper divisors (4278650525).

72157312243 is a wasteful number, since it uses less digits than its factorization.

72157312243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1894613.

The product of its digits is 70560, while the sum is 37.

It can be divided in two parts, 72157 and 312243, that added together give a square (384400 = 620²).

The spelling of 72157312243 in words is "seventy-two billion, one hundred fifty-seven million, three hundred twelve thousand, two hundred forty-three".