166601901 has 8 divisors (see below), whose sum is σ = 227553984. Its totient is φ = 108358880.

The previous prime is 166601893. The next prime is 166601917. The reversal of 166601901 is 109106661.

It is a happy number.

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 166601901 - 2³ = 166601893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166601951) 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, 677121 + ... + 677366.

It is an arithmetic number, because the mean of its divisors is an integer number (28444248).

Almost surely, 2^166601901 is an apocalyptic number.

It is an amenable number.

166601901 is a deficient number, since it is larger than the sum of its proper divisors (60952083).

166601901 is a wasteful number, since it uses less digits than its factorization.

166601901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354531.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 166601901 is about 12907.4358801429. The cubic root of 166601901 is about 550.2499150738.

The spelling of 166601901 in words is "one hundred sixty-six million, six hundred one thousand, nine hundred one".