72423563609 has 2 divisors, whose sum is σ = 72423563610. Its totient is φ = 72423563608.

The previous prime is 72423563581. The next prime is 72423563647. The reversal of 72423563609 is 90636532427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52992040000 + 19431523609 = 230200^2 + 139397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72423563609 is a prime.

It is not a weakly prime, because it can be changed into another prime (72423563309) 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, 36211781804 + 36211781805.

It is an arithmetic number, because the mean of its divisors is an integer number (36211781805).

Almost surely, 2^72423563609 is an apocalyptic number.

It is an amenable number.

72423563609 is a deficient number, since it is larger than the sum of its proper divisors (1).

72423563609 is an equidigital number, since it uses as much as digits as its factorization.

72423563609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1632960, while the sum is 47.

The spelling of 72423563609 in words is "seventy-two billion, four hundred twenty-three million, five hundred sixty-three thousand, six hundred nine".