72139422449 has 2 divisors, whose sum is σ = 72139422450. Its totient is φ = 72139422448.

The previous prime is 72139422379. The next prime is 72139422457. The reversal of 72139422449 is 94422493127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47217117025 + 24922305424 = 217295^2 + 157868^2 .

It is a cyclic number.

It is not a de Polignac number, because 72139422449 - 2⁸ = 72139422193 is a prime.

It is not a weakly prime, because it can be changed into another prime (72139422499) 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, 36069711224 + 36069711225.

It is an arithmetic number, because the mean of its divisors is an integer number (36069711225).

Almost surely, 2^72139422449 is an apocalyptic number.

It is an amenable number.

72139422449 is a deficient number, since it is larger than the sum of its proper divisors (1).

72139422449 is an equidigital number, since it uses as much as digits as its factorization.

72139422449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 47.

The spelling of 72139422449 in words is "seventy-two billion, one hundred thirty-nine million, four hundred twenty-two thousand, four hundred forty-nine".