166086901 has 6 divisors (see below), whose sum is σ = 168119030.
Its totient is φ = 164079048.
The previous prime is 166086839. The next prime is 166086911. The reversal of 166086901 is 109680661.
It can be written as a sum of positive squares in only one way, i.e., 148864401 + 17222500 = 12201^2 + 4150^2
It is not a de Polignac number, because 166086901 - 223 = 157698293 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 (166086911) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5166 + ... + 18943.
Almost surely, 2166086901 is an apocalyptic number.
166086901 is the 6889-th nonagonal number.
It is an amenable number.
166086901 is a deficient number, since it is larger than the sum of its proper divisors (2032129).
166086901 is an frugal number, since it uses more digits than its factorization.
166086901 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 24275 (or 24192 counting only the distinct ones).
The product of its (nonzero) digits is 15552, while the sum is 37.
The square root of 166086901 is about 12887.4706983178.
The cubic root of 166086901 is about 549.6823521176.
The spelling of 166086901 in words is "one hundred sixty-six million, eighty-six thousand, nine hundred one".