164466721 has 24 divisors (see below), whose sum is σ = 184789440. Its totient is φ = 146057472.

The previous prime is 164466691. The next prime is 164466727. The reversal of 164466721 is 127664461.

It is not a de Polignac number, because 164466721 - 2⁷ = 164466593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164466727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 724410 + ... + 724636.

It is an arithmetic number, because the mean of its divisors is an integer number (7699560).

Almost surely, 2^164466721 is an apocalyptic number.

It is an amenable number.

164466721 is a deficient number, since it is larger than the sum of its proper divisors (20322719).

164466721 is a wasteful number, since it uses less digits than its factorization.

164466721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 376 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 164466721 is about 12824.4579222671. The cubic root of 164466721 is about 547.8891221231.

The spelling of 164466721 in words is "one hundred sixty-four million, four hundred sixty-six thousand, seven hundred twenty-one".