6686785949 has 2 divisors, whose sum is σ = 6686785950. Its totient is φ = 6686785948.

The previous prime is 6686785849. The next prime is 6686785979. The reversal of 6686785949 is 9495876866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3691413049 + 2995372900 = 60757^2 + 54730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6686785949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6686785979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343392974 + 3343392975.

It is an arithmetic number, because the mean of its divisors is an integer number (3343392975).

Almost surely, 2^6686785949 is an apocalyptic number.

It is an amenable number.

6686785949 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686785949 is an equidigital number, since it uses as much as digits as its factorization.

6686785949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156764160, while the sum is 68.

The square root of 6686785949 is about 81772.7702172306. The cubic root of 6686785949 is about 1883.9634533152.

The spelling of 6686785949 in words is "six billion, six hundred eighty-six million, seven hundred eighty-five thousand, nine hundred forty-nine".