6665052821 has 8 divisors (see below), whose sum is σ = 7742075904. Its totient is φ = 5619247920.

The previous prime is 6665052743. The next prime is 6665052839. The reversal of 6665052821 is 1282505666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6665052821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665052871) 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, 7804085 + ... + 7804938.

It is an arithmetic number, because the mean of its divisors is an integer number (967759488).

Almost surely, 2^6665052821 is an apocalyptic number.

6665052821 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6665052821 is a deficient number, since it is larger than the sum of its proper divisors (1077023083).

6665052821 is a wasteful number, since it uses less digits than its factorization.

6665052821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15609091.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 6665052821 is about 81639.7747485869. The cubic root of 6665052821 is about 1881.9201768140.

The spelling of 6665052821 in words is "six billion, six hundred sixty-five million, fifty-two thousand, eight hundred twenty-one".