72243176309 has 2 divisors, whose sum is σ = 72243176310. Its totient is φ = 72243176308.

The previous prime is 72243176267. The next prime is 72243176359. The reversal of 72243176309 is 90367134227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62775302500 + 9467873809 = 250550^2 + 97303^2 .

It is a cyclic number.

It is not a de Polignac number, because 72243176309 - 2²⁴ = 72226399093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72243176309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72243176359) 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 as a sum of consecutive naturals, namely, 36121588154 + 36121588155.

It is an arithmetic number, because the mean of its divisors is an integer number (36121588155).

Almost surely, 2^72243176309 is an apocalyptic number.

It is an amenable number.

72243176309 is a deficient number, since it is larger than the sum of its proper divisors (1).

72243176309 is an equidigital number, since it uses as much as digits as its factorization.

72243176309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 44.

The spelling of 72243176309 in words is "seventy-two billion, two hundred forty-three million, one hundred seventy-six thousand, three hundred nine".