6667319977 has 2 divisors, whose sum is σ = 6667319978. Its totient is φ = 6667319976.

The previous prime is 6667319959. The next prime is 6667320059. The reversal of 6667319977 is 7799137666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6390563481 + 276756496 = 79941^2 + 16636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6667319977 is a prime.

It is not a weakly prime, because it can be changed into another prime (6667319177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333659988 + 3333659989.

It is an arithmetic number, because the mean of its divisors is an integer number (3333659989).

Almost surely, 2^6667319977 is an apocalyptic number.

It is an amenable number.

6667319977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667319977 is an equidigital number, since it uses as much as digits as its factorization.

6667319977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18003384, while the sum is 61.

The square root of 6667319977 is about 81653.6586871648. The cubic root of 6667319977 is about 1882.1335346101.

The spelling of 6667319977 in words is "six billion, six hundred sixty-seven million, three hundred nineteen thousand, nine hundred seventy-seven".