6665850553 has 4 divisors (see below), whose sum is σ = 6668588260. Its totient is φ = 6663112848.

The previous prime is 6665850523. The next prime is 6665850559. The reversal of 6665850553 is 3550585666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6427549584 + 238300969 = 80172^2 + 15437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6665850553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6665850497 and 6665850506.

It is not an unprimeable number, because it can be changed into a prime (6665850559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1365198 + ... + 1370071.

It is an arithmetic number, because the mean of its divisors is an integer number (1667147065).

Almost surely, 2^6665850553 is an apocalyptic number.

It is an amenable number.

6665850553 is a deficient number, since it is larger than the sum of its proper divisors (2737707).

6665850553 is a wasteful number, since it uses less digits than its factorization.

6665850553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737706.

The product of its (nonzero) digits is 3240000, while the sum is 49.

The square root of 6665850553 is about 81644.6602846751. The cubic root of 6665850553 is about 1881.9952553916.

The spelling of 6665850553 in words is "six billion, six hundred sixty-five million, eight hundred fifty thousand, five hundred fifty-three".