72267503821 has 2 divisors, whose sum is σ = 72267503822. Its totient is φ = 72267503820.

The previous prime is 72267503813. The next prime is 72267503881. The reversal of 72267503821 is 12830576227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72054664900 + 212838921 = 268430^2 + 14589^2 .

It is a cyclic number.

It is not a de Polignac number, because 72267503821 - 2³ = 72267503813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72267503881) by changing a digit.

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 as a sum of consecutive naturals, namely, 36133751910 + 36133751911.

It is an arithmetic number, because the mean of its divisors is an integer number (36133751911).

Almost surely, 2^72267503821 is an apocalyptic number.

It is an amenable number.

72267503821 is a deficient number, since it is larger than the sum of its proper divisors (1).

72267503821 is an equidigital number, since it uses as much as digits as its factorization.

72267503821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 72267503821 in words is "seventy-two billion, two hundred sixty-seven million, five hundred three thousand, eight hundred twenty-one".