164738236765 has 4 divisors (see below), whose sum is σ = 197685884124. Its totient is φ = 131790589408.

The previous prime is 164738236757. The next prime is 164738236777. The reversal of 164738236765 is 567632837461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 567632837461 = 53 ⋅10710053537.

It can be written as a sum of positive squares in 2 ways, for example, as 47963628036 + 116774608729 = 219006^2 + 341723^2 .

It is a cyclic number.

It is not a de Polignac number, because 164738236765 - 2³ = 164738236757 is a prime.

It is a Smith number, since the sum of its digits (58) 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 an unprimeable number.

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, 16473823672 + ... + 16473823681.

It is an arithmetic number, because the mean of its divisors is an integer number (49421471031).

Almost surely, 2^164738236765 is an apocalyptic number.

It is an amenable number.

164738236765 is a deficient number, since it is larger than the sum of its proper divisors (32947647359).

164738236765 is an equidigital number, since it uses as much as digits as its factorization.

164738236765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32947647358.

The product of its digits is 30481920, while the sum is 58.

The spelling of 164738236765 in words is "one hundred sixty-four billion, seven hundred thirty-eight million, two hundred thirty-six thousand, seven hundred sixty-five".