6685956577 has 2 divisors, whose sum is σ = 6685956578. Its totient is φ = 6685956576.

The previous prime is 6685956481. The next prime is 6685956581. The reversal of 6685956577 is 7756595866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6029367201 + 656589376 = 77649^2 + 25624^2 .

It is a cyclic number.

It is not a de Polignac number, because 6685956577 - 2⁷ = 6685956449 is a prime.

It is not a weakly prime, because it can be changed into another prime (6685950577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342978288 + 3342978289.

It is an arithmetic number, because the mean of its divisors is an integer number (3342978289).

Almost surely, 2^6685956577 is an apocalyptic number.

It is an amenable number.

6685956577 is a deficient number, since it is larger than the sum of its proper divisors (1).

6685956577 is an equidigital number, since it uses as much as digits as its factorization.

6685956577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256000, while the sum is 64.

The square root of 6685956577 is about 81767.6988608583. The cubic root of 6685956577 is about 1883.8855598322.

The spelling of 6685956577 in words is "six billion, six hundred eighty-five million, nine hundred fifty-six thousand, five hundred seventy-seven".