72205218922 has 4 divisors (see below), whose sum is σ = 108307828386. Its totient is φ = 36102609460.

The previous prime is 72205218791. The next prime is 72205218947. The reversal of 72205218922 is 22981250227.

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

It can be written as a sum of positive squares in only one way, i.e., 53403050281 + 18802168641 = 231091^2 + 137121^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18051304729 + ... + 18051304732.

Almost surely, 2^72205218922 is an apocalyptic number.

72205218922 is a deficient number, since it is larger than the sum of its proper divisors (36102609464).

72205218922 is a wasteful number, since it uses less digits than its factorization.

72205218922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36102609463.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 72205218922 in words is "seventy-two billion, two hundred five million, two hundred eighteen thousand, nine hundred twenty-two".