85666564679 has 8 divisors (see below), whose sum is σ = 90708974928. Its totient is φ = 80624510080.

The previous prime is 85666564673. The next prime is 85666564699. The reversal of 85666564679 is 97646566658.

It is a happy number.

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

It is not a de Polignac number, because 85666564679 - 2¹⁶ = 85666499143 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 (85666564673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 530264 + ... + 672690.

It is an arithmetic number, because the mean of its divisors is an integer number (11338621866).

Almost surely, 2^85666564679 is an apocalyptic number.

85666564679 is a deficient number, since it is larger than the sum of its proper divisors (5042410249).

85666564679 is a wasteful number, since it uses less digits than its factorization.

85666564679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177825.

The product of its digits is 391910400, while the sum is 68.

The spelling of 85666564679 in words is "eighty-five billion, six hundred sixty-six million, five hundred sixty-four thousand, six hundred seventy-nine".