72578735787109 has 2 divisors, whose sum is σ = 72578735787110. Its totient is φ = 72578735787108.

The previous prime is 72578735787091. The next prime is 72578735787137. The reversal of 72578735787109 is 90178753787527.

Together with previous prime (72578735787091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71639042080225 + 939693706884 = 8463985^2 + 969378^2 .

It is a cyclic number.

It is not a de Polignac number, because 72578735787109 - 2⁹ = 72578735786597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72578735787209) 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, 36289367893554 + 36289367893555.

It is an arithmetic number, because the mean of its divisors is an integer number (36289367893555).

Almost surely, 2^{72578735787109} is an apocalyptic number.

It is an amenable number.

72578735787109 is a deficient number, since it is larger than the sum of its proper divisors (1).

72578735787109 is an equidigital number, since it uses as much as digits as its factorization.

72578735787109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1452124800, while the sum is 76.

The spelling of 72578735787109 in words is "seventy-two trillion, five hundred seventy-eight billion, seven hundred thirty-five million, seven hundred eighty-seven thousand, one hundred nine".