166106621 has 16 divisors (see below), whose sum is σ = 178416000. Its totient is φ = 154260480.

The previous prime is 166106597. The next prime is 166106623. The reversal of 166106621 is 126601661.

It is a cyclic number.

It is not a de Polignac number, because 166106621 - 2⁶ = 166106557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166106623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332630 + ... + 333128.

It is an arithmetic number, because the mean of its divisors is an integer number (11151000).

Almost surely, 2^166106621 is an apocalyptic number.

It is an amenable number.

166106621 is a deficient number, since it is larger than the sum of its proper divisors (12309379).

166106621 is a wasteful number, since it uses less digits than its factorization.

166106621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 166106621 is about 12888.2357597927. The cubic root of 166106621 is about 549.7041064060.

The spelling of 166106621 in words is "one hundred sixty-six million, one hundred six thousand, six hundred twenty-one".