1665144204 has 24 divisors (see below), whose sum is σ = 3886362480. Its totient is φ = 554901504.

The previous prime is 1665144191. The next prime is 1665144209. The reversal of 1665144204 is 4024415661.

It is a super-2 number, since 2×1665144204² = 5545410440229587232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1665144209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35292 + ... + 67644.

It is an arithmetic number, because the mean of its divisors is an integer number (161931770).

Almost surely, 2^1665144204 is an apocalyptic number.

It is an amenable number.

1665144204 is an abundant number, since it is smaller than the sum of its proper divisors (2221218276).

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

1665144204 is a wasteful number, since it uses less digits than its factorization.

1665144204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36649 (or 36647 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 1665144204 is about 40806.1785027709. The cubic root of 1665144204 is about 1185.2699756966.

Adding to 1665144204 its reverse (4024415661), we get a palindrome (5689559865).

The spelling of 1665144204 in words is "one billion, six hundred sixty-five million, one hundred forty-four thousand, two hundred four".