85891221573 has 4 divisors (see below), whose sum is σ = 114521628768. Its totient is φ = 57260814380.

The previous prime is 85891221541. The next prime is 85891221599. The reversal of 85891221573 is 37512219858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85891221573 - 2⁵ = 85891221541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85891221473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14315203593 + ... + 14315203598.

It is an arithmetic number, because the mean of its divisors is an integer number (28630407192).

Almost surely, 2^85891221573 is an apocalyptic number.

It is an amenable number.

85891221573 is a deficient number, since it is larger than the sum of its proper divisors (28630407195).

85891221573 is a wasteful number, since it uses less digits than its factorization.

85891221573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28630407194.

The product of its digits is 1209600, while the sum is 51.

The spelling of 85891221573 in words is "eighty-five billion, eight hundred ninety-one million, two hundred twenty-one thousand, five hundred seventy-three".