6651160661 has 2 divisors, whose sum is σ = 6651160662. Its totient is φ = 6651160660.

The previous prime is 6651160627. The next prime is 6651160667. The reversal of 6651160661 is 1660611566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4530097636 + 2121063025 = 67306^2 + 46055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6651160661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6651160667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325580330 + 3325580331.

It is an arithmetic number, because the mean of its divisors is an integer number (3325580331).

Almost surely, 2^6651160661 is an apocalyptic number.

It is an amenable number.

6651160661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6651160661 is an equidigital number, since it uses as much as digits as its factorization.

6651160661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 6651160661 is about 81554.6483101975. The cubic root of 6651160661 is about 1880.6117540026.

The spelling of 6651160661 in words is "six billion, six hundred fifty-one million, one hundred sixty thousand, six hundred sixty-one".