165085307578 has 4 divisors (see below), whose sum is σ = 247627961370. Its totient is φ = 82542653788.

The previous prime is 165085307561. The next prime is 165085307579. The reversal of 165085307578 is 875703580561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 120626319969 + 44458987609 = 347313^2 + 210853^2 .

It is not an unprimeable number, because it can be changed into a prime (165085307579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41271326893 + ... + 41271326896.

Almost surely, 2^165085307578 is an apocalyptic number.

165085307578 is a deficient number, since it is larger than the sum of its proper divisors (82542653792).

165085307578 is an equidigital number, since it uses as much as digits as its factorization.

165085307578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82542653791.

The product of its (nonzero) digits is 7056000, while the sum is 55.

The spelling of 165085307578 in words is "one hundred sixty-five billion, eighty-five million, three hundred seven thousand, five hundred seventy-eight".