6651552766 has 4 divisors (see below), whose sum is σ = 9977329152. Its totient is φ = 3325776382.

The previous prime is 6651552751. The next prime is 6651552799. The reversal of 6651552766 is 6672551566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6672551566 = 2 ⋅3336275783.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1662888190 + ... + 1662888193.

It is an arithmetic number, because the mean of its divisors is an integer number (2494332288).

Almost surely, 2^6651552766 is an apocalyptic number.

6651552766 is a deficient number, since it is larger than the sum of its proper divisors (3325776386).

6651552766 is a wasteful number, since it uses less digits than its factorization.

6651552766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325776385.

The product of its digits is 2268000, while the sum is 49.

The square root of 6651552766 is about 81557.0522149986. The cubic root of 6651552766 is about 1880.6487090956.

The spelling of 6651552766 in words is "six billion, six hundred fifty-one million, five hundred fifty-two thousand, seven hundred sixty-six".