166033621 has 8 divisors (see below), whose sum is σ = 182964320. Its totient is φ = 149697072.

The previous prime is 166033607. The next prime is 166033661. The reversal of 166033621 is 126330661.

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 166033621 - 2¹⁷ = 165902549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166033621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166033661) 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, 147951 + ... + 149068.

It is an arithmetic number, because the mean of its divisors is an integer number (22870540).

Almost surely, 2^166033621 is an apocalyptic number.

It is an amenable number.

166033621 is a deficient number, since it is larger than the sum of its proper divisors (16930699).

166033621 is a wasteful number, since it uses less digits than its factorization.

166033621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297075.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 166033621 is about 12885.4034085084. The cubic root of 166033621 is about 549.6235672128.

The spelling of 166033621 in words is "one hundred sixty-six million, thirty-three thousand, six hundred twenty-one".