165396541518 has 32 divisors (see below), whose sum is σ = 395820784800. Its totient is φ = 50891243328.

The previous prime is 165396541511. The next prime is 165396541561. The reversal of 165396541518 is 815145693561.

It is a happy number.

165396541518 is a `hidden beast` number, since 1 + 6 + 5 + 3 + 96 + 541 + 5 + 1 + 8 = 666.

It is a super-2 number, since 2×165396541518² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165396541511) 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 15 ways as a sum of consecutive naturals, for example, 117803103 + ... + 117804506.

It is an arithmetic number, because the mean of its divisors is an integer number (12369399525).

Almost surely, 2^165396541518 is an apocalyptic number.

165396541518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165396541518 is an abundant number, since it is smaller than the sum of its proper divisors (230424243282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165396541518 is a wasteful number, since it uses less digits than its factorization.

165396541518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235607633 (or 235607627 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 54.

The spelling of 165396541518 in words is "one hundred sixty-five billion, three hundred ninety-six million, five hundred forty-one thousand, five hundred eighteen".