72220521458 has 6 divisors (see below), whose sum is σ = 108331352271. Its totient is φ = 36110070702.

The previous prime is 72220521427. The next prime is 72220521469. The reversal of 72220521458 is 85412502227.

It can be written as a sum of positive squares in only one way, i.e., 36110260729 + 36110260729 = 190027^2 + 190027^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=190027.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 285041 + ... + 475067.

Almost surely, 2^72220521458 is an apocalyptic number.

72220521458 is a deficient number, since it is larger than the sum of its proper divisors (36110830813).

72220521458 is an frugal number, since it uses more digits than its factorization.

72220521458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380056 (or 190029 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 38.

The spelling of 72220521458 in words is "seventy-two billion, two hundred twenty million, five hundred twenty-one thousand, four hundred fifty-eight".