667888889953 has 2 divisors, whose sum is σ = 667888889954. Its totient is φ = 667888889952.

The previous prime is 667888889951. The next prime is 667888889999. The reversal of 667888889953 is 359988888766.

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., 663977263104 + 3911626849 = 814848^2 + 62543^2 .

It is a cyclic number.

It is not a de Polignac number, because 667888889953 - 2¹ = 667888889951 is a prime.

Together with 667888889951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (667888889951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333944444976 + 333944444977.

It is an arithmetic number, because the mean of its divisors is an integer number (333944444977).

Almost surely, 2^667888889953 is an apocalyptic number.

It is an amenable number.

667888889953 is a deficient number, since it is larger than the sum of its proper divisors (1).

667888889953 is an equidigital number, since it uses as much as digits as its factorization.

667888889953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10032906240, while the sum is 85.

The spelling of 667888889953 in words is "six hundred sixty-seven billion, eight hundred eighty-eight million, eight hundred eighty-nine thousand, nine hundred fifty-three".