165885985830 has 16 divisors (see below), whose sum is σ = 398126366064. Its totient is φ = 44236262880.

The previous prime is 165885985819. The next prime is 165885985831. The reversal of 165885985830 is 38589588561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165885985831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2764766401 + ... + 2764766460.

It is an arithmetic number, because the mean of its divisors is an integer number (24882897879).

Almost surely, 2^165885985830 is an apocalyptic number.

165885985830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165885985830 is an abundant number, since it is smaller than the sum of its proper divisors (232240380234).

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

165885985830 is a wasteful number, since it uses less digits than its factorization.

165885985830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529532871.

The product of its (nonzero) digits is 82944000, while the sum is 66.

The spelling of 165885985830 in words is "one hundred sixty-five billion, eight hundred eighty-five million, nine hundred eighty-five thousand, eight hundred thirty".