666676057 has 2 divisors, whose sum is σ = 666676058. Its totient is φ = 666676056.

The previous prime is 666676051. The next prime is 666676081. The reversal of 666676057 is 750676666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334853401 + 331822656 = 18299^2 + 18216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666676057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666676057.

It is not a weakly prime, because it can be changed into another prime (666676051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333338028 + 333338029.

It is an arithmetic number, because the mean of its divisors is an integer number (333338029).

Almost surely, 2^666676057 is an apocalyptic number.

It is an amenable number.

666676057 is a deficient number, since it is larger than the sum of its proper divisors (1).

666676057 is an equidigital number, since it uses as much as digits as its factorization.

666676057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The square root of 666676057 is about 25820.0708170989. The cubic root of 666676057 is about 873.5845663229.

The spelling of 666676057 in words is "six hundred sixty-six million, six hundred seventy-six thousand, fifty-seven".