166303621 has 8 divisors (see below), whose sum is σ = 181574784. Its totient is φ = 151057920.

The previous prime is 166303619. The next prime is 166303633. The reversal of 166303621 is 126303661.

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 166303621 - 2¹ = 166303619 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 166303621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166303681) 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, 8901 + ... + 20293.

It is an arithmetic number, because the mean of its divisors is an integer number (22696848).

Almost surely, 2^166303621 is an apocalyptic number.

166303621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166303621 is a deficient number, since it is larger than the sum of its proper divisors (15271163).

166303621 is a wasteful number, since it uses less digits than its factorization.

166303621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12731.

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

The square root of 166303621 is about 12895.8761237847. The cubic root of 166303621 is about 549.9213342036.

The spelling of 166303621 in words is "one hundred sixty-six million, three hundred three thousand, six hundred twenty-one".