666672525947 has 2 divisors, whose sum is σ = 666672525948. Its totient is φ = 666672525946.

The previous prime is 666672525923. The next prime is 666672525989. The reversal of 666672525947 is 749525276666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666672525947 - 2¹⁰ = 666672524923 is a prime.

It is not a weakly prime, because it can be changed into another prime (666672528947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333336262973 + 333336262974.

It is an arithmetic number, because the mean of its divisors is an integer number (333336262974).

Almost surely, 2^666672525947 is an apocalyptic number.

666672525947 is a deficient number, since it is larger than the sum of its proper divisors (1).

666672525947 is an equidigital number, since it uses as much as digits as its factorization.

666672525947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 228614400, while the sum is 65.

The spelling of 666672525947 in words is "six hundred sixty-six billion, six hundred seventy-two million, five hundred twenty-five thousand, nine hundred forty-seven".