165721774322 has 16 divisors (see below), whose sum is σ = 283451723352. Its totient is φ = 71987738880.

The previous prime is 165721774321. The next prime is 165721774327. The reversal of 165721774322 is 223477127561.

165721774322 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 99528261361 + 66193512961 = 315481^2 + 257281^2 .

It is not an unprimeable number, because it can be changed into a prime (165721774321) 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 7 ways as a sum of consecutive naturals, for example, 187467629 + ... + 187468512.

Almost surely, 2^165721774322 is an apocalyptic number.

165721774322 is a deficient number, since it is larger than the sum of its proper divisors (117729949030).

165721774322 is a wasteful number, since it uses less digits than its factorization.

165721774322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374936173.

The product of its digits is 987840, while the sum is 47.

The spelling of 165721774322 in words is "one hundred sixty-five billion, seven hundred twenty-one million, seven hundred seventy-four thousand, three hundred twenty-two".