165206974969 has 4 divisors (see below), whose sum is σ = 165207914896. Its totient is φ = 165206035044.

The previous prime is 165206974909. The next prime is 165206974973. The reversal of 165206974969 is 969479602561.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 165206974969 - 2²³ = 165198586361 is a prime.

It is a super-2 number, since 2×165206974969² (a number of 23 digits) contains 22 as substring.

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 165206974969.

It is not an unprimeable number, because it can be changed into a prime (165206974909) 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, 118899 + ... + 586984.

It is an arithmetic number, because the mean of its divisors is an integer number (41301978724).

Almost surely, 2^165206974969 is an apocalyptic number.

It is an amenable number.

165206974969 is a deficient number, since it is larger than the sum of its proper divisors (939927).

165206974969 is an equidigital number, since it uses as much as digits as its factorization.

165206974969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939926.

The product of its (nonzero) digits is 44089920, while the sum is 64.

The spelling of 165206974969 in words is "one hundred sixty-five billion, two hundred six million, nine hundred seventy-four thousand, nine hundred sixty-nine".