667031742889 has 2 divisors, whose sum is σ = 667031742890. Its totient is φ = 667031742888.

The previous prime is 667031742869. The next prime is 667031742919. The reversal of 667031742889 is 988247130766.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 665516587264 + 1515155625 = 815792^2 + 38925^2 .

It is a cyclic number.

It is not a de Polignac number, because 667031742889 - 2¹³ = 667031734697 is a prime.

It is not a weakly prime, because it can be changed into another prime (667031742869) 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, 333515871444 + 333515871445.

It is an arithmetic number, because the mean of its divisors is an integer number (333515871445).

Almost surely, 2^667031742889 is an apocalyptic number.

It is an amenable number.

667031742889 is a deficient number, since it is larger than the sum of its proper divisors (1).

667031742889 is an equidigital number, since it uses as much as digits as its factorization.

667031742889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 667031742889 in words is "six hundred sixty-seven billion, thirty-one million, seven hundred forty-two thousand, eight hundred eighty-nine".