6651551566 has 8 divisors (see below), whose sum is σ = 10884357144. Its totient is φ = 3023432520.

The previous prime is 6651551519. The next prime is 6651551579.

6651551566 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151171605 + ... + 151171648.

It is an arithmetic number, because the mean of its divisors is an integer number (1360544643).

Almost surely, 2^6651551566 is an apocalyptic number.

6651551566 is a deficient number, since it is larger than the sum of its proper divisors (4232805578).

6651551566 is a wasteful number, since it uses less digits than its factorization.

6651551566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302343266.

The product of its digits is 810000, while the sum is 46.

The square root of 6651551566 is about 81557.0448581850. The cubic root of 6651551566 is about 1880.6485960003.

The spelling of 6651551566 in words is "six billion, six hundred fifty-one million, five hundred fifty-one thousand, five hundred sixty-six".