85517644671533 has 2 divisors, whose sum is σ = 85517644671534. Its totient is φ = 85517644671532.

The previous prime is 85517644671521. The next prime is 85517644671587. The reversal of 85517644671533 is 33517644671558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46363052957764 + 39154591713769 = 6809042^2 + 6257363^2 .

It is a cyclic number.

It is not a de Polignac number, because 85517644671533 - 2¹⁰ = 85517644670509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85517644671533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85517644671733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42758822335766 + 42758822335767.

It is an arithmetic number, because the mean of its divisors is an integer number (42758822335767).

Almost surely, 2^{85517644671533} is an apocalyptic number.

It is an amenable number.

85517644671533 is a deficient number, since it is larger than the sum of its proper divisors (1).

85517644671533 is an equidigital number, since it uses as much as digits as its factorization.

85517644671533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016000, while the sum is 65.

The spelling of 85517644671533 in words is "eighty-five trillion, five hundred seventeen billion, six hundred forty-four million, six hundred seventy-one thousand, five hundred thirty-three".