85497281665 has 8 divisors (see below), whose sum is σ = 102606153768. Its totient is φ = 68391548160.

The previous prime is 85497281629. The next prime is 85497281669. The reversal of 85497281665 is 56618279458.

It can be written as a sum of positive squares in 4 ways, for example, as 27696947776 + 57800333889 = 166424^2 + 240417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85497281665 - 2¹⁷ = 85497150593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85497281669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724296 + ... + 834025.

It is an arithmetic number, because the mean of its divisors is an integer number (12825769221).

Almost surely, 2^85497281665 is an apocalyptic number.

It is an amenable number.

85497281665 is a deficient number, since it is larger than the sum of its proper divisors (17108872103).

85497281665 is a wasteful number, since it uses less digits than its factorization.

85497281665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569299.

The product of its digits is 29030400, while the sum is 61.

The spelling of 85497281665 in words is "eighty-five billion, four hundred ninety-seven million, two hundred eighty-one thousand, six hundred sixty-five".