164246561 has 4 divisors (see below), whose sum is σ = 164928324. Its totient is φ = 163564800.

The previous prime is 164246543. The next prime is 164246567. The reversal of 164246561 is 165642461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165642461 = 29 ⋅5711809.

It can be written as a sum of positive squares in 2 ways, for example, as 102718225 + 61528336 = 10135^2 + 7844^2 .

It is a cyclic number.

It is not a de Polignac number, because 164246561 - 2²⁶ = 97137697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164246567) 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 3 ways as a sum of consecutive naturals, for example, 340520 + ... + 341001.

It is an arithmetic number, because the mean of its divisors is an integer number (41232081).

Almost surely, 2^164246561 is an apocalyptic number.

It is an amenable number.

164246561 is a deficient number, since it is larger than the sum of its proper divisors (681763).

164246561 is an equidigital number, since it uses as much as digits as its factorization.

164246561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681762.

The product of its digits is 34560, while the sum is 35.

The square root of 164246561 is about 12815.8714491056. The cubic root of 164246561 is about 547.6445394466.

It can be divided in two parts, 16 and 4246561, that multiplied together give a palindrome (67944976).

The spelling of 164246561 in words is "one hundred sixty-four million, two hundred forty-six thousand, five hundred sixty-one".