164382200581 has 4 divisors (see below), whose sum is σ = 164697713964. Its totient is φ = 164066687200.

The previous prime is 164382200579. The next prime is 164382200659. The reversal of 164382200581 is 185002283461.

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 81915591681 + 82466608900 = 286209^2 + 287170^2 .

It is a cyclic number.

It is not a de Polignac number, because 164382200581 - 2¹ = 164382200579 is a prime.

It is a super-2 number, since 2×164382200581² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164382200551) 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 in 3 ways as a sum of consecutive naturals, for example, 157755910 + ... + 157756951.

It is an arithmetic number, because the mean of its divisors is an integer number (41174428491).

Almost surely, 2^164382200581 is an apocalyptic number.

It is an amenable number.

164382200581 is a deficient number, since it is larger than the sum of its proper divisors (315513383).

164382200581 is an equidigital number, since it uses as much as digits as its factorization.

164382200581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315513382.

The product of its (nonzero) digits is 92160, while the sum is 40.

The spelling of 164382200581 in words is "one hundred sixty-four billion, three hundred eighty-two million, two hundred thousand, five hundred eighty-one".