164566189021 has 4 divisors (see below), whose sum is σ = 177225126652. Its totient is φ = 151907251392.

The previous prime is 164566189001. The next prime is 164566189063. The reversal of 164566189021 is 120981665461.

It is a happy number.

164566189021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120981665461 = 547 ⋅221173063.

It can be written as a sum of positive squares in 2 ways, for example, as 31016140996 + 133550048025 = 176114^2 + 365445^2 .

It is not a de Polignac number, because 164566189021 - 2¹⁵ = 164566156253 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 (164566189001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6329468796 + ... + 6329468821.

It is an arithmetic number, because the mean of its divisors is an integer number (44306281663).

Almost surely, 2^164566189021 is an apocalyptic number.

It is an amenable number.

164566189021 is a deficient number, since it is larger than the sum of its proper divisors (12658937631).

164566189021 is a wasteful number, since it uses less digits than its factorization.

164566189021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12658937630.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 164566189021 in words is "one hundred sixty-four billion, five hundred sixty-six million, one hundred eighty-nine thousand, twenty-one".