165903550799 has 24 divisors (see below), whose sum is σ = 193611420288. Its totient is φ = 141745793280.

The previous prime is 165903550739. The next prime is 165903550843. The reversal of 165903550799 is 997055309561.

165903550799 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165903550799 - 2⁸ = 165903550543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165903550739) 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 23 ways as a sum of consecutive naturals, for example, 21874562 + ... + 21882144.

It is an arithmetic number, because the mean of its divisors is an integer number (8067142512).

Almost surely, 2^165903550799 is an apocalyptic number.

165903550799 is a deficient number, since it is larger than the sum of its proper divisors (27707869489).

165903550799 is an equidigital number, since it uses as much as digits as its factorization.

165903550799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8975 (or 8968 counting only the distinct ones).

The product of its (nonzero) digits is 11481750, while the sum is 59.

The spelling of 165903550799 in words is "one hundred sixty-five billion, nine hundred three million, five hundred fifty thousand, seven hundred ninety-nine".