165604494280 has 32 divisors (see below), whose sum is σ = 394528355640. Its totient is φ = 62345221120.

The previous prime is 165604494271. The next prime is 165604494281. The reversal of 165604494280 is 82494406561.

It can be written as a sum of positive squares in 4 ways, for example, as 133016301796 + 32588192484 = 364714^2 + 180522^2 .

It is not an unprimeable number, because it can be changed into a prime (165604494281) 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 7 ways as a sum of consecutive naturals, for example, 121767331 + ... + 121768690.

Almost surely, 2^165604494280 is an apocalyptic number.

165604494280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165604494280 is an abundant number, since it is smaller than the sum of its proper divisors (228923861360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165604494280 is a wasteful number, since it uses less digits than its factorization.

165604494280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243536049 (or 243536045 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 165604494280 in words is "one hundred sixty-five billion, six hundred four million, four hundred ninety-four thousand, two hundred eighty".