72645571540517 has 2 divisors, whose sum is σ = 72645571540518. Its totient is φ = 72645571540516.

The previous prime is 72645571540489. The next prime is 72645571540573. The reversal of 72645571540517 is 71504517554627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67790044707841 + 4855526832676 = 8233471^2 + 2203526^2 .

It is a cyclic number.

It is not a de Polignac number, because 72645571540517 - 2¹⁸ = 72645571278373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72645571500517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36322785770258 + 36322785770259.

It is an arithmetic number, because the mean of its divisors is an integer number (36322785770259).

Almost surely, 2^{72645571540517} is an apocalyptic number.

It is an amenable number.

72645571540517 is a deficient number, since it is larger than the sum of its proper divisors (1).

72645571540517 is an equidigital number, since it uses as much as digits as its factorization.

72645571540517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41160000, while the sum is 59.

The spelling of 72645571540517 in words is "seventy-two trillion, six hundred forty-five billion, five hundred seventy-one million, five hundred forty thousand, five hundred seventeen".