72218534251 has 8 divisors (see below), whose sum is σ = 72956941200. Its totient is φ = 71482962720.

The previous prime is 72218534243. The next prime is 72218534263. The reversal of 72218534251 is 15243581227.

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 72218534251 - 2³ = 72218534243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72218534231) 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 7 ways as a sum of consecutive naturals, for example, 657636 + ... + 759553.

It is an arithmetic number, because the mean of its divisors is an integer number (9119617650).

Almost surely, 2^72218534251 is an apocalyptic number.

72218534251 is a deficient number, since it is larger than the sum of its proper divisors (738406949).

72218534251 is a wasteful number, since it uses less digits than its factorization.

72218534251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417709.

The product of its digits is 134400, while the sum is 40.

The spelling of 72218534251 in words is "seventy-two billion, two hundred eighteen million, five hundred thirty-four thousand, two hundred fifty-one".