72701724517 has 4 divisors (see below), whose sum is σ = 72713004300. Its totient is φ = 72690444736.

The previous prime is 72701724479. The next prime is 72701724523. The reversal of 72701724517 is 71542710727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71542710727 = 20117 ⋅3556331.

It can be written as a sum of positive squares in 2 ways, for example, as 57712374756 + 14989349761 = 240234^2 + 122431^2 .

It is a cyclic number.

It is not a de Polignac number, because 72701724517 - 2¹¹ = 72701722469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72701724217) 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 in 3 ways as a sum of consecutive naturals, for example, 5630218 + ... + 5643115.

It is an arithmetic number, because the mean of its divisors is an integer number (18178251075).

Almost surely, 2^72701724517 is an apocalyptic number.

It is an amenable number.

72701724517 is a deficient number, since it is larger than the sum of its proper divisors (11279783).

72701724517 is a wasteful number, since it uses less digits than its factorization.

72701724517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11279782.

The product of its (nonzero) digits is 192080, while the sum is 43.

The spelling of 72701724517 in words is "seventy-two billion, seven hundred one million, seven hundred twenty-four thousand, five hundred seventeen".