165408674509 has 8 divisors (see below), whose sum is σ = 187507809440. Its totient is φ = 144648881136.

The previous prime is 165408674503. The next prime is 165408674521. The reversal of 165408674509 is 905476804561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165408674509 - 2¹⁷ = 165408543437 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 165408674509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165408674503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334835127 + ... + 334835620.

It is an arithmetic number, because the mean of its divisors is an integer number (23438476180).

Almost surely, 2^165408674509 is an apocalyptic number.

165408674509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

165408674509 is a deficient number, since it is larger than the sum of its proper divisors (22099134931).

165408674509 is a wasteful number, since it uses less digits than its factorization.

165408674509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669670779.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 165408674509 in words is "one hundred sixty-five billion, four hundred eight million, six hundred seventy-four thousand, five hundred nine".