165666443954 has 8 divisors (see below), whose sum is σ = 271090544688. Its totient is φ = 75302929060.

The previous prime is 165666443867. The next prime is 165666443993. The reversal of 165666443954 is 459344666561.

165666443954 is digitally balanced in base 2, 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 a junction number, because it is equal to n+sod(n) for n = 165666443893 and 165666443902.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3765146432 + ... + 3765146475.

It is an arithmetic number, because the mean of its divisors is an integer number (33886318086).

Almost surely, 2^165666443954 is an apocalyptic number.

165666443954 is a deficient number, since it is larger than the sum of its proper divisors (105424100734).

165666443954 is a wasteful number, since it uses less digits than its factorization.

165666443954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7530292920.

The product of its digits is 55987200, while the sum is 59.

The spelling of 165666443954 in words is "one hundred sixty-five billion, six hundred sixty-six million, four hundred forty-three thousand, nine hundred fifty-four".