6651197977 has 2 divisors, whose sum is σ = 6651197978. Its totient is φ = 6651197976.

The previous prime is 6651197957. The next prime is 6651197999. The reversal of 6651197977 is 7797911566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5878135561 + 773062416 = 76669^2 + 27804^2 .

It is a cyclic number.

It is not a de Polignac number, because 6651197977 - 2⁷ = 6651197849 is a prime.

It is not a weakly prime, because it can be changed into another prime (6651197957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325598988 + 3325598989.

It is an arithmetic number, because the mean of its divisors is an integer number (3325598989).

Almost surely, 2^6651197977 is an apocalyptic number.

It is an amenable number.

6651197977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6651197977 is an equidigital number, since it uses as much as digits as its factorization.

6651197977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5000940, while the sum is 58.

The square root of 6651197977 is about 81554.8770889884. The cubic root of 6651197977 is about 1880.6152710217.

The spelling of 6651197977 in words is "six billion, six hundred fifty-one million, one hundred ninety-seven thousand, nine hundred seventy-seven".