1665845853 has 32 divisors (see below), whose sum is σ = 2624643072. Its totient is φ = 919684800.

The previous prime is 1665845851. The next prime is 1665845899. The reversal of 1665845853 is 3585485661.

It is a happy number.

It is not a de Polignac number, because 1665845853 - 2¹ = 1665845851 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1665845796 and 1665845805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665845851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 475438 + ... + 478928.

It is an arithmetic number, because the mean of its divisors is an integer number (82020096).

Almost surely, 2^1665845853 is an apocalyptic number.

It is an amenable number.

1665845853 is a deficient number, since it is larger than the sum of its proper divisors (958797219).

1665845853 is a wasteful number, since it uses less digits than its factorization.

1665845853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4265.

The product of its digits is 3456000, while the sum is 51.

The square root of 1665845853 is about 40814.7749350649. The cubic root of 1665845853 is about 1185.4364330935.

The spelling of 1665845853 in words is "one billion, six hundred sixty-five million, eight hundred forty-five thousand, eight hundred fifty-three".