164885641 has 4 divisors (see below), whose sum is σ = 168907284. Its totient is φ = 160864000.

The previous prime is 164885627. The next prime is 164885659. The reversal of 164885641 is 146588461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87516025 + 77369616 = 9355^2 + 8796^2 .

It is a cyclic number.

It is not a de Polignac number, because 164885641 - 2⁹ = 164885129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164885681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010760 + ... + 2010841.

It is an arithmetic number, because the mean of its divisors is an integer number (42226821).

Almost surely, 2^164885641 is an apocalyptic number.

It is an amenable number.

164885641 is a deficient number, since it is larger than the sum of its proper divisors (4021643).

164885641 is an equidigital number, since it uses as much as digits as its factorization.

164885641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021642.

The product of its digits is 184320, while the sum is 43.

The square root of 164885641 is about 12840.7803890574. The cubic root of 164885641 is about 548.3539114134.

The spelling of 164885641 in words is "one hundred sixty-four million, eight hundred eighty-five thousand, six hundred forty-one".