85722186917 has 4 divisors (see below), whose sum is σ = 85839134700. Its totient is φ = 85605239136.

The previous prime is 85722186887. The next prime is 85722186971. The reversal of 85722186917 is 71968122758.

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 43497690721 + 42224496196 = 208561^2 + 205486^2 .

It is a cyclic number.

It is not a de Polignac number, because 85722186917 - 2⁶ = 85722186853 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 (85722186997) 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 3 ways as a sum of consecutive naturals, for example, 58472792 + ... + 58474257.

It is an arithmetic number, because the mean of its divisors is an integer number (21459783675).

Almost surely, 2^85722186917 is an apocalyptic number.

It is an amenable number.

85722186917 is a deficient number, since it is larger than the sum of its proper divisors (116947783).

85722186917 is a wasteful number, since it uses less digits than its factorization.

85722186917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116947782.

The product of its digits is 3386880, while the sum is 56.

The spelling of 85722186917 in words is "eighty-five billion, seven hundred twenty-two million, one hundred eighty-six thousand, nine hundred seventeen".