165903550801 has 16 divisors (see below), whose sum is σ = 172315542528. Its totient is φ = 159614884800.

The previous prime is 165903550739. The next prime is 165903550843. The reversal of 165903550801 is 108055309561.

It is a cyclic number.

It is not a de Polignac number, because 165903550801 - 2¹¹ = 165903548753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165903550301) 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 15 ways as a sum of consecutive naturals, for example, 4951816 + ... + 4985206.

It is an arithmetic number, because the mean of its divisors is an integer number (10769721408).

Almost surely, 2^165903550801 is an apocalyptic number.

It is an amenable number.

165903550801 is a deficient number, since it is larger than the sum of its proper divisors (6411991727).

165903550801 is a wasteful number, since it uses less digits than its factorization.

165903550801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35232.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 165903550801 in words is "one hundred sixty-five billion, nine hundred three million, five hundred fifty thousand, eight hundred one".