166621016 has 32 divisors (see below), whose sum is σ = 332951040. Its totient is φ = 77988768.

The previous prime is 166621009. The next prime is 166621019. The reversal of 166621016 is 610126661.

166621016 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 166621016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166621019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 986 + ... + 18281.

It is an arithmetic number, because the mean of its divisors is an integer number (10404720).

Almost surely, 2^166621016 is an apocalyptic number.

It is an amenable number.

166621016 is a deficient number, since it is larger than the sum of its proper divisors (166330024).

166621016 is a wasteful number, since it uses less digits than its factorization.

166621016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19343 (or 19339 counting only the distinct ones).

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

The square root of 166621016 is about 12908.1763235555. The cubic root of 166621016 is about 550.2709585009.

Adding to 166621016 its reverse (610126661), we get a palindrome (776747677).

The spelling of 166621016 in words is "one hundred sixty-six million, six hundred twenty-one thousand, sixteen".