85644663677 has 4 divisors (see below), whose sum is σ = 85742320956. Its totient is φ = 85547006400.

The previous prime is 85644663673. The next prime is 85644663679. The reversal of 85644663677 is 77636644658.

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 64671541636 + 20973122041 = 254306^2 + 144821^2 .

It is a cyclic number.

It is not a de Polignac number, because 85644663677 - 2² = 85644663673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85644663673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48827324 + ... + 48829077.

It is an arithmetic number, because the mean of its divisors is an integer number (21435580239).

Almost surely, 2^85644663677 is an apocalyptic number.

It is an amenable number.

85644663677 is a deficient number, since it is larger than the sum of its proper divisors (97657279).

85644663677 is an equidigital number, since it uses as much as digits as its factorization.

85644663677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97657278.

The product of its digits is 121927680, while the sum is 62.

The spelling of 85644663677 in words is "eighty-five billion, six hundred forty-four million, six hundred sixty-three thousand, six hundred seventy-seven".