85447765219 has 4 divisors (see below), whose sum is σ = 89945016040. Its totient is φ = 80950514400.

The previous prime is 85447765211. The next prime is 85447765231. The reversal of 85447765219 is 91256774458.

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

It is a cyclic number.

It is not a de Polignac number, because 85447765219 - 2³ = 85447765211 is a prime.

It is a super-2 number, since 2×85447765219² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85447765211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2248625382 + ... + 2248625419.

It is an arithmetic number, because the mean of its divisors is an integer number (22486254010).

Almost surely, 2^85447765219 is an apocalyptic number.

85447765219 is a deficient number, since it is larger than the sum of its proper divisors (4497250821).

85447765219 is a wasteful number, since it uses less digits than its factorization.

85447765219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4497250820.

The product of its digits is 16934400, while the sum is 58.

The spelling of 85447765219 in words is "eighty-five billion, four hundred forty-seven million, seven hundred sixty-five thousand, two hundred nineteen".