165445533856999 has 4 divisors (see below), whose sum is σ = 180486036934920. Its totient is φ = 150405030779080.

The previous prime is 165445533856973. The next prime is 165445533857017. The reversal of 165445533856999 is 999658335544561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165445533856999 - 2¹⁹ = 165445533332711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165445533856919) 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, 7520251538944 + ... + 7520251538965.

It is an arithmetic number, because the mean of its divisors is an integer number (45121509233730).

Almost surely, 2^{165445533856999} is an apocalyptic number.

165445533856999 is a deficient number, since it is larger than the sum of its proper divisors (15040503077921).

165445533856999 is a wasteful number, since it uses less digits than its factorization.

165445533856999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15040503077920.

The product of its digits is 18895680000, while the sum is 82.

The spelling of 165445533856999 in words is "one hundred sixty-five trillion, four hundred forty-five billion, five hundred thirty-three million, eight hundred fifty-six thousand, nine hundred ninety-nine".