166187109 has 8 divisors (see below), whose sum is σ = 241726752. Its totient is φ = 100719440.

The previous prime is 166187107. The next prime is 166187113. The reversal of 166187109 is 901781661.

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

It is a cyclic number.

It is not a de Polignac number, because 166187109 - 2¹ = 166187107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166187107) 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, 2517954 + ... + 2518019.

It is an arithmetic number, because the mean of its divisors is an integer number (30215844).

Almost surely, 2^166187109 is an apocalyptic number.

It is an amenable number.

166187109 is a deficient number, since it is larger than the sum of its proper divisors (75539643).

166187109 is a wasteful number, since it uses less digits than its factorization.

166187109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5035987.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 166187109 is about 12891.3579191643. The cubic root of 166187109 is about 549.7928795876.

The spelling of 166187109 in words is "one hundred sixty-six million, one hundred eighty-seven thousand, one hundred nine".