165858723856 has 40 divisors (see below), whose sum is σ = 367895242880. Its totient is φ = 70959089664.

The previous prime is 165858723851. The next prime is 165858723859. The reversal of 165858723856 is 658327858561.

165858723856 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (165858723851) 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 7 ways as a sum of consecutive naturals, for example, 1218636 + ... + 1347883.

It is an arithmetic number, because the mean of its divisors is an integer number (9197381072).

Almost surely, 2^165858723856 is an apocalyptic number.

165858723856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165858723856 is an abundant number, since it is smaller than the sum of its proper divisors (202036519024).

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

165858723856 is a wasteful number, since it uses less digits than its factorization.

165858723856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567111 (or 2567105 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 64.

The spelling of 165858723856 in words is "one hundred sixty-five billion, eight hundred fifty-eight million, seven hundred twenty-three thousand, eight hundred fifty-six".