165100404 has 72 divisors (see below), whose sum is σ = 455575008. Its totient is φ = 46388160.

The previous prime is 165100391. The next prime is 165100409. The reversal of 165100404 is 404001561.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165100409) 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 23 ways as a sum of consecutive naturals, for example, 33567 + ... + 38169.

Almost surely, 2^165100404 is an apocalyptic number.

165100404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165100404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227787504).

165100404 is an abundant number, since it is smaller than the sum of its proper divisors (290474604).

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

165100404 is a wasteful number, since it uses less digits than its factorization.

165100404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4685 (or 4676 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 165100404 is about 12849.1402046985. The cubic root of 165100404 is about 548.5918845066.

Adding to 165100404 its reverse (404001561), we get a palindrome (569101965).

The spelling of 165100404 in words is "one hundred sixty-five million, one hundred thousand, four hundred four".