165673149403 has 4 divisors (see below), whose sum is σ = 167669211528. Its totient is φ = 163677087280.

The previous prime is 165673149373. The next prime is 165673149431. The reversal of 165673149403 is 304941376561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304941376561 = 17 ⋅17937728033.

It is a cyclic number.

It is not a de Polignac number, because 165673149403 - 2⁹ = 165673148891 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165673149203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998030938 + ... + 998031103.

It is an arithmetic number, because the mean of its divisors is an integer number (41917302882).

Almost surely, 2^165673149403 is an apocalyptic number.

165673149403 is a deficient number, since it is larger than the sum of its proper divisors (1996062125).

165673149403 is an equidigital number, since it uses as much as digits as its factorization.

165673149403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996062124.

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 165673149403 in words is "one hundred sixty-five billion, six hundred seventy-three million, one hundred forty-nine thousand, four hundred three".