85717879487 has 4 divisors (see below), whose sum is σ = 86148622800. Its totient is φ = 85287136176.

The previous prime is 85717879459. The next prime is 85717879523. The reversal of 85717879487 is 78497871758.

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 85717879487 - 2¹² = 85717875391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85717879487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85717879447) 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, 215371358 + ... + 215371755.

It is an arithmetic number, because the mean of its divisors is an integer number (21537155700).

Almost surely, 2^85717879487 is an apocalyptic number.

85717879487 is a deficient number, since it is larger than the sum of its proper divisors (430743313).

85717879487 is a wasteful number, since it uses less digits than its factorization.

85717879487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430743312.

The product of its digits is 221276160, while the sum is 71.

The spelling of 85717879487 in words is "eighty-five billion, seven hundred seventeen million, eight hundred seventy-nine thousand, four hundred eighty-seven".