165170585840 has 40 divisors (see below), whose sum is σ = 413561738688. Its totient is φ = 60986062080.

The previous prime is 165170585807. The next prime is 165170585843. The reversal of 165170585840 is 48585071561.

165170585840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165170585843) 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, 79407896 + ... + 79409975.

Almost surely, 2^165170585840 is an apocalyptic number.

165170585840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165170585840 is an abundant number, since it is smaller than the sum of its proper divisors (248391152848).

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

165170585840 is a wasteful number, since it uses less digits than its factorization.

165170585840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158817897 (or 158817891 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 50.

The spelling of 165170585840 in words is "one hundred sixty-five billion, one hundred seventy million, five hundred eighty-five thousand, eight hundred forty".