165312404 has 6 divisors (see below), whose sum is σ = 289296714. Its totient is φ = 82656200.

The previous prime is 165312401. The next prime is 165312409. The reversal of 165312404 is 404213561.

It can be written as a sum of positive squares in only one way, i.e., 149328400 + 15984004 = 12220^2 + 3998^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165312401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20664047 + ... + 20664054.

It is an arithmetic number, because the mean of its divisors is an integer number (48216119).

Almost surely, 2^165312404 is an apocalyptic number.

It is an amenable number.

165312404 is a deficient number, since it is larger than the sum of its proper divisors (123984310).

165312404 is a wasteful number, since it uses less digits than its factorization.

165312404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41328105 (or 41328103 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 165312404 is about 12857.3871373619. The cubic root of 165312404 is about 548.8265936746.

Adding to 165312404 its reverse (404213561), we get a palindrome (569525965).

The spelling of 165312404 in words is "one hundred sixty-five million, three hundred twelve thousand, four hundred four".