165812084749 has 4 divisors (see below), whose sum is σ = 169856281980. Its totient is φ = 161767887520.

The previous prime is 165812084729. The next prime is 165812084773. The reversal of 165812084749 is 947480218561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 947480218561 = 157793 ⋅6004577.

It can be written as a sum of positive squares in 2 ways, for example, as 64557662724 + 101254422025 = 254082^2 + 318205^2 .

It is a cyclic number.

It is not a de Polignac number, because 165812084749 - 2¹⁷ = 165811953677 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165812084749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165812084729) 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 3 ways as a sum of consecutive naturals, for example, 2022098554 + ... + 2022098635.

It is an arithmetic number, because the mean of its divisors is an integer number (42464070495).

Almost surely, 2^165812084749 is an apocalyptic number.

It is an amenable number.

165812084749 is a deficient number, since it is larger than the sum of its proper divisors (4044197231).

165812084749 is an equidigital number, since it uses as much as digits as its factorization.

165812084749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044197230.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 165812084749 in words is "one hundred sixty-five billion, eight hundred twelve million, eighty-four thousand, seven hundred forty-nine".