72180203266 has 8 divisors (see below), whose sum is σ = 108271508220. Its totient is φ = 36089700528.

The previous prime is 72180203237. The next prime is 72180203267. The reversal of 72180203266 is 66230208127.

It can be written as a sum of positive squares in 2 ways, for example, as 70452554041 + 1727649225 = 265429^2 + 41565^2 .

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

It is not an unprimeable number, because it can be changed into a prime (72180203267) 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 3 ways as a sum of consecutive naturals, for example, 140140 + ... + 404968.

Almost surely, 2^72180203266 is an apocalyptic number.

72180203266 is a deficient number, since it is larger than the sum of its proper divisors (36091304954).

72180203266 is a wasteful number, since it uses less digits than its factorization.

72180203266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401108.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 72180203266 in words is "seventy-two billion, one hundred eighty million, two hundred three thousand, two hundred sixty-six".