165776476765 has 4 divisors (see below), whose sum is σ = 198931772124. Its totient is φ = 132621181408.

The previous prime is 165776476763. The next prime is 165776476777. The reversal of 165776476765 is 567674677561.

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 39560414404 + 126216062361 = 198898^2 + 355269^2 .

It is a cyclic number.

It is not a de Polignac number, because 165776476765 - 2¹ = 165776476763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165776476765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165776476763) 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, 16577647672 + ... + 16577647681.

It is an arithmetic number, because the mean of its divisors is an integer number (49732943031).

Almost surely, 2^165776476765 is an apocalyptic number.

It is an amenable number.

165776476765 is a deficient number, since it is larger than the sum of its proper divisors (33155295359).

165776476765 is an equidigital number, since it uses as much as digits as its factorization.

165776476765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33155295358.

The product of its digits is 311169600, while the sum is 67.

The spelling of 165776476765 in words is "one hundred sixty-five billion, seven hundred seventy-six million, four hundred seventy-six thousand, seven hundred sixty-five".