166681831686 has 16 divisors (see below), whose sum is σ = 333383045184. Its totient is φ = 55557380264.

The previous prime is 166681831663. The next prime is 166681831691. The reversal of 166681831686 is 686138186661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694560 + ... + 903203.

It is an arithmetic number, because the mean of its divisors is an integer number (20836440324).

Almost surely, 2^166681831686 is an apocalyptic number.

166681831686 is an abundant number, since it is smaller than the sum of its proper divisors (166701213498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166681831686 is a wasteful number, since it uses less digits than its factorization.

166681831686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615155.

The product of its digits is 11943936, while the sum is 60.

The spelling of 166681831686 in words is "one hundred sixty-six billion, six hundred eighty-one million, eight hundred thirty-one thousand, six hundred eighty-six".