165373905869 has 4 divisors (see below), whose sum is σ = 165377631744. Its totient is φ = 165370179996.

The previous prime is 165373905799. The next prime is 165373905913. The reversal of 165373905869 is 968509373561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 968509373561 = 8171 ⋅118530091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165373905869 is a prime.

It is a super-2 number, since 2×165373905869² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165373925869) 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, 1795547 + ... + 1885400.

It is an arithmetic number, because the mean of its divisors is an integer number (41344407936).

Almost surely, 2^165373905869 is an apocalyptic number.

It is an amenable number.

165373905869 is a deficient number, since it is larger than the sum of its proper divisors (3725875).

165373905869 is an equidigital number, since it uses as much as digits as its factorization.

165373905869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3725874.

The product of its (nonzero) digits is 36741600, while the sum is 62.

The spelling of 165373905869 in words is "one hundred sixty-five billion, three hundred seventy-three million, nine hundred five thousand, eight hundred sixty-nine".