85644863571 has 8 divisors (see below), whose sum is σ = 114198094800. Its totient is φ = 57094104032.

The previous prime is 85644863561. The next prime is 85644863573. The reversal of 85644863571 is 17536844658.

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

It is a cyclic number.

It is not a de Polignac number, because 85644863571 - 2⁵ = 85644863539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85644863573) 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 7 ways as a sum of consecutive naturals, for example, 535500 + ... + 676793.

It is an arithmetic number, because the mean of its divisors is an integer number (14274761850).

Almost surely, 2^85644863571 is an apocalyptic number.

85644863571 is a deficient number, since it is larger than the sum of its proper divisors (28553231229).

85644863571 is a wasteful number, since it uses less digits than its factorization.

85644863571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235845.

The product of its digits is 19353600, while the sum is 57.

The spelling of 85644863571 in words is "eighty-five billion, six hundred forty-four million, eight hundred sixty-three thousand, five hundred seventy-one".