1665044101 has 8 divisors (see below), whose sum is σ = 1903247360. Its totient is φ = 1426925808.

The previous prime is 1665044099. The next prime is 1665044113. The reversal of 1665044101 is 1014405661.

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

It is not a de Polignac number, because 1665044101 - 2¹ = 1665044099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1665044101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665044201) 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, 28540 + ... + 64378.

It is an arithmetic number, because the mean of its divisors is an integer number (237905920).

Almost surely, 2^1665044101 is an apocalyptic number.

It is an amenable number.

1665044101 is a deficient number, since it is larger than the sum of its proper divisors (238203259).

1665044101 is an equidigital number, since it uses as much as digits as its factorization.

1665044101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42483.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1665044101 is about 40804.9519176288. The cubic root of 1665044101 is about 1185.2462237080.

Adding to 1665044101 its reverse (1014405661), we get a palindrome (2679449762).

The spelling of 1665044101 in words is "one billion, six hundred sixty-five million, forty-four thousand, one hundred one".