666679001 has 2 divisors, whose sum is σ = 666679002. Its totient is φ = 666679000.

The previous prime is 666678949. The next prime is 666679019. The reversal of 666679001 is 100976666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 627001600 + 39677401 = 25040^2 + 6299^2 .

It is a cyclic number.

It is not a de Polignac number, because 666679001 - 2¹⁸ = 666416857 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666679001.

It is not a weakly prime, because it can be changed into another prime (666679031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333339500 + 333339501.

It is an arithmetic number, because the mean of its divisors is an integer number (333339501).

Almost surely, 2^666679001 is an apocalyptic number.

It is an amenable number.

666679001 is a deficient number, since it is larger than the sum of its proper divisors (1).

666679001 is an equidigital number, since it uses as much as digits as its factorization.

666679001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 666679001 is about 25820.1278269493. The cubic root of 666679001 is about 873.5858522194.

The spelling of 666679001 in words is "six hundred sixty-six million, six hundred seventy-nine thousand, one".