667025082721 has 2 divisors, whose sum is σ = 667025082722. Its totient is φ = 667025082720.

The previous prime is 667025082701. The next prime is 667025082749. The reversal of 667025082721 is 127280520766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501773889600 + 165251193121 = 708360^2 + 406511^2 .

It is a cyclic number.

It is not a de Polignac number, because 667025082721 - 2²¹ = 667022985569 is a prime.

It is not a weakly prime, because it can be changed into another prime (667025082701) 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, 333512541360 + 333512541361.

It is an arithmetic number, because the mean of its divisors is an integer number (333512541361).

Almost surely, 2^667025082721 is an apocalyptic number.

It is an amenable number.

667025082721 is a deficient number, since it is larger than the sum of its proper divisors (1).

667025082721 is an equidigital number, since it uses as much as digits as its factorization.

667025082721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 667025082721 in words is "six hundred sixty-seven billion, twenty-five million, eighty-two thousand, seven hundred twenty-one".