1665043842 has 32 divisors (see below), whose sum is σ = 4151798784. Its totient is φ = 432478800.

The previous prime is 1665043823. The next prime is 1665043873. The reversal of 1665043842 is 2483405661.

It is a self number, because there is not a number n which added to its sum of digits gives 1665043842.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1801534 + ... + 1802457.

It is an arithmetic number, because the mean of its divisors is an integer number (129743712).

Almost surely, 2^1665043842 is an apocalyptic number.

1665043842 is an abundant number, since it is smaller than the sum of its proper divisors (2486754942).

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

1665043842 is a wasteful number, since it uses less digits than its factorization.

1665043842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3604014.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 1665043842 is about 40804.9487439943. The cubic root of 1665043842 is about 1185.2461622524.

The spelling of 1665043842 in words is "one billion, six hundred sixty-five million, forty-three thousand, eight hundred forty-two".