165811855802 has 8 divisors (see below), whose sum is σ = 256740938112. Its totient is φ = 80231543100.

The previous prime is 165811855789. The next prime is 165811855837. The reversal of 165811855802 is 208558118561.

It is a happy number.

165811855802 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1337192324 + ... + 1337192447.

It is an arithmetic number, because the mean of its divisors is an integer number (32092617264).

Almost surely, 2^165811855802 is an apocalyptic number.

165811855802 is a deficient number, since it is larger than the sum of its proper divisors (90929082310).

165811855802 is a wasteful number, since it uses less digits than its factorization.

165811855802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2674384804.

The product of its (nonzero) digits is 768000, while the sum is 50.

The spelling of 165811855802 in words is "one hundred sixty-five billion, eight hundred eleven million, eight hundred fifty-five thousand, eight hundred two".