72436545397 has 2 divisors, whose sum is σ = 72436545398. Its totient is φ = 72436545396.

The previous prime is 72436545341. The next prime is 72436545409. The reversal of 72436545397 is 79354563427.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66940695441 + 5495849956 = 258729^2 + 74134^2 .

It is a cyclic number.

It is not a de Polignac number, because 72436545397 - 2²³ = 72428156789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72436545317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36218272698 + 36218272699.

It is an arithmetic number, because the mean of its divisors is an integer number (36218272699).

Almost surely, 2^72436545397 is an apocalyptic number.

It is an amenable number.

72436545397 is a deficient number, since it is larger than the sum of its proper divisors (1).

72436545397 is an equidigital number, since it uses as much as digits as its factorization.

72436545397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19051200, while the sum is 55.

The spelling of 72436545397 in words is "seventy-two billion, four hundred thirty-six million, five hundred forty-five thousand, three hundred ninety-seven".