85439653297 has 4 divisors (see below), whose sum is σ = 85603645476. Its totient is φ = 85275661120.

The previous prime is 85439653253. The next prime is 85439653333. The reversal of 85439653297 is 79235693458.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61227048481 + 24212604816 = 247441^2 + 155604^2 .

It is a cyclic number.

It is not a de Polignac number, because 85439653297 - 2¹⁵ = 85439620529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85439650297) 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, 81995308 + ... + 81996349.

It is an arithmetic number, because the mean of its divisors is an integer number (21400911369).

Almost surely, 2^85439653297 is an apocalyptic number.

It is an amenable number.

85439653297 is a deficient number, since it is larger than the sum of its proper divisors (163992179).

85439653297 is a wasteful number, since it uses less digits than its factorization.

85439653297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163992178.

The product of its digits is 48988800, while the sum is 61.

The spelling of 85439653297 in words is "eighty-five billion, four hundred thirty-nine million, six hundred fifty-three thousand, two hundred ninety-seven".