164211646 has 4 divisors (see below), whose sum is σ = 246317472. Its totient is φ = 82105822.

The previous prime is 164211631. The next prime is 164211647. The reversal of 164211646 is 646112461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 646112461 = 19 ⋅34005919.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164211647) 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 as a sum of consecutive naturals, namely, 41052910 + ... + 41052913.

It is an arithmetic number, because the mean of its divisors is an integer number (61579368).

Almost surely, 2^164211646 is an apocalyptic number.

164211646 is a deficient number, since it is larger than the sum of its proper divisors (82105826).

164211646 is an equidigital number, since it uses as much as digits as its factorization.

164211646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82105825.

The product of its digits is 6912, while the sum is 31.

The square root of 164211646 is about 12814.5091985608. The cubic root of 164211646 is about 547.6057311979.

The spelling of 164211646 in words is "one hundred sixty-four million, two hundred eleven thousand, six hundred forty-six".