146664221 has 16 divisors (see below), whose sum is σ = 163066176. Its totient is φ = 131890000.

The previous prime is 146664181. The next prime is 146664229. The reversal of 146664221 is 122466641.

It is not a de Polignac number, because 146664221 - 2¹⁸ = 146402077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146664229) 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 15 ways as a sum of consecutive naturals, for example, 133886 + ... + 134976.

It is an arithmetic number, because the mean of its divisors is an integer number (10191636).

Almost surely, 2^146664221 is an apocalyptic number.

146664221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

146664221 is a deficient number, since it is larger than the sum of its proper divisors (16401955).

146664221 is a wasteful number, since it uses less digits than its factorization.

146664221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225 (or 1203 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 146664221 is about 12110.5004438297. The cubic root of 146664221 is about 527.3610616165.

The spelling of 146664221 in words is "one hundred forty-six million, six hundred sixty-four thousand, two hundred twenty-one".