86666731673 has 4 divisors (see below), whose sum is σ = 88087497828. Its totient is φ = 85245965520.

The previous prime is 86666731631. The next prime is 86666731699. The reversal of 86666731673 is 37613766668.

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 51007319104 + 35659412569 = 225848^2 + 188837^2 .

It is a cyclic number.

It is not a de Polignac number, because 86666731673 - 2¹⁸ = 86666469529 is a prime.

It is a super-2 number, since 2×86666731673² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86666331673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710382986 + ... + 710383107.

It is an arithmetic number, because the mean of its divisors is an integer number (22021874457).

Almost surely, 2^86666731673 is an apocalyptic number.

It is an amenable number.

86666731673 is a deficient number, since it is larger than the sum of its proper divisors (1420766155).

86666731673 is a wasteful number, since it uses less digits than its factorization.

86666731673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420766154.

The product of its digits is 27433728, while the sum is 59.

The spelling of 86666731673 in words is "eighty-six billion, six hundred sixty-six million, seven hundred thirty-one thousand, six hundred seventy-three".