72173702130065 has 16 divisors (see below), whose sum is σ = 86661532979280. Its totient is φ = 57703569715200.

The previous prime is 72173702129981. The next prime is 72173702130071. The reversal of 72173702130065 is 56003120737127.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 92396545024 + 72081305585041 = 303968^2 + 8490071^2 .

It is not a de Polignac number, because 72173702130065 - 2¹⁰ = 72173702129041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72173702129998 and 72173702130025.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 509886221 + ... + 510027749.

It is an arithmetic number, because the mean of its divisors is an integer number (5416345811205).

Almost surely, 2^{72173702130065} is an apocalyptic number.

It is an amenable number.

72173702130065 is a deficient number, since it is larger than the sum of its proper divisors (14487830849215).

72173702130065 is a wasteful number, since it uses less digits than its factorization.

72173702130065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203332.

The product of its (nonzero) digits is 370440, while the sum is 44.

The spelling of 72173702130065 in words is "seventy-two trillion, one hundred seventy-three billion, seven hundred two million, one hundred thirty thousand, sixty-five".