6651220803 has 4 divisors (see below), whose sum is σ = 8868294408. Its totient is φ = 4434147200.

The previous prime is 6651220781. The next prime is 6651220813. The reversal of 6651220803 is 3080221566.

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

It is a cyclic number.

It is not a de Polignac number, because 6651220803 - 2⁹ = 6651220291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6651220813) 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, 1108536798 + ... + 1108536803.

It is an arithmetic number, because the mean of its divisors is an integer number (2217073602).

Almost surely, 2^6651220803 is an apocalyptic number.

6651220803 is a deficient number, since it is larger than the sum of its proper divisors (2217073605).

6651220803 is a wasteful number, since it uses less digits than its factorization.

6651220803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217073604.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 6651220803 is about 81555.0170314494. The cubic root of 6651220803 is about 1880.6174223572.

The spelling of 6651220803 in words is "six billion, six hundred fifty-one million, two hundred twenty thousand, eight hundred three".