1665044041 has 4 divisors (see below), whose sum is σ = 1678154752. Its totient is φ = 1651933332.

The previous prime is 1665044033. The next prime is 1665044063. The reversal of 1665044041 is 1404405661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1404405661 = 211 ⋅6655951.

It is a cyclic number.

It is not a de Polignac number, because 1665044041 - 2³ = 1665044033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1665043994 and 1665044012.

It is not an unprimeable number, because it can be changed into a prime (1665044011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6555165 + ... + 6555418.

It is an arithmetic number, because the mean of its divisors is an integer number (419538688).

Almost surely, 2^1665044041 is an apocalyptic number.

It is an amenable number.

1665044041 is a deficient number, since it is larger than the sum of its proper divisors (13110711).

1665044041 is a wasteful number, since it uses less digits than its factorization.

1665044041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13110710.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1665044041 is about 40804.9511824239. The cubic root of 1665044041 is about 1185.2462094712.

The spelling of 1665044041 in words is "one billion, six hundred sixty-five million, forty-four thousand, forty-one".