165683866993 has 32 divisors (see below), whose sum is σ = 175829068800. Its totient is φ = 156107476800.

The previous prime is 165683866963. The next prime is 165683867009. The reversal of 165683866993 is 399668386561.

It is a happy number.

165683866993 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 165683866993 - 2¹³ = 165683858801 is a prime.

It is a super-2 number, since 2×165683866993² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (302330880) is a multiple of the sum of its prime divisors (864).

It is not an unprimeable number, because it can be changed into a prime (165683866903) 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 31 ways as a sum of consecutive naturals, for example, 359400783 + ... + 359401243.

It is an arithmetic number, because the mean of its divisors is an integer number (5494658400).

Almost surely, 2^165683866993 is an apocalyptic number.

It is an amenable number.

165683866993 is a deficient number, since it is larger than the sum of its proper divisors (10145201807).

165683866993 is an equidigital number, since it uses as much as digits as its factorization.

165683866993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 864 counting only the distinct ones).

The product of its digits is 302330880, while the sum is 70.

The spelling of 165683866993 in words is "one hundred sixty-five billion, six hundred eighty-three million, eight hundred sixty-six thousand, nine hundred ninety-three".