72839657549 has 2 divisors, whose sum is σ = 72839657550. Its totient is φ = 72839657548.

The previous prime is 72839657543. The next prime is 72839657647. The reversal of 72839657549 is 94575693827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64436268649 + 8403388900 = 253843^2 + 91670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72839657549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72839657543) 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, 36419828774 + 36419828775.

It is an arithmetic number, because the mean of its divisors is an integer number (36419828775).

Almost surely, 2^72839657549 is an apocalyptic number.

It is an amenable number.

72839657549 is a deficient number, since it is larger than the sum of its proper divisors (1).

72839657549 is an equidigital number, since it uses as much as digits as its factorization.

72839657549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114307200, while the sum is 65.

The spelling of 72839657549 in words is "seventy-two billion, eight hundred thirty-nine million, six hundred fifty-seven thousand, five hundred forty-nine".