164376681565 has 4 divisors (see below), whose sum is σ = 197252017884. Its totient is φ = 131501345248.

The previous prime is 164376681563. The next prime is 164376681577. The reversal of 164376681565 is 565186673461.

164376681565 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.

It can be written as a sum of positive squares in 2 ways, for example, as 95922761796 + 68453919769 = 309714^2 + 261637^2 .

It is a cyclic number.

It is not a de Polignac number, because 164376681565 - 2¹ = 164376681563 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 (164376681563) 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, 16437668152 + ... + 16437668161.

It is an arithmetic number, because the mean of its divisors is an integer number (49313004471).

Almost surely, 2^164376681565 is an apocalyptic number.

It is an amenable number.

164376681565 is a deficient number, since it is larger than the sum of its proper divisors (32875336319).

164376681565 is an equidigital number, since it uses as much as digits as its factorization.

164376681565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32875336318.

The product of its digits is 21772800, while the sum is 58.

The spelling of 164376681565 in words is "one hundred sixty-four billion, three hundred seventy-six million, six hundred eighty-one thousand, five hundred sixty-five".