166104621 has 16 divisors (see below), whose sum is σ = 246395520. Its totient is φ = 110594880.

The previous prime is 166104619. The next prime is 166104667. The reversal of 166104621 is 126401661.

166104621 is a `hidden beast` number, since 1 + 6 + 610 + 46 + 2 + 1 = 666.

It is not a de Polignac number, because 166104621 - 2¹ = 166104619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166114621) 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, 20296 + ... + 27278.

It is an arithmetic number, because the mean of its divisors is an integer number (15399720).

Almost surely, 2^166104621 is an apocalyptic number.

It is an amenable number.

166104621 is a deficient number, since it is larger than the sum of its proper divisors (80290899).

166104621 is an equidigital number, since it uses as much as digits as its factorization.

166104621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7873 (or 7867 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 166104621 is about 12888.1581694205. The cubic root of 166104621 is about 549.7019001672.

The spelling of 166104621 in words is "one hundred sixty-six million, one hundred four thousand, six hundred twenty-one".