128266673 has 2 divisors, whose sum is σ = 128266674. Its totient is φ = 128266672.

The previous prime is 128266669. The next prime is 128266693. The reversal of 128266673 is 376662821.

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., 69022864 + 59243809 = 8308^2 + 7697^2 .

It is a cyclic number.

It is not a de Polignac number, because 128266673 - 2² = 128266669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128266673.

It is not a weakly prime, because it can be changed into another prime (128266603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64133336 + 64133337.

It is an arithmetic number, because the mean of its divisors is an integer number (64133337).

Almost surely, 2^128266673 is an apocalyptic number.

It is an amenable number.

128266673 is a deficient number, since it is larger than the sum of its proper divisors (1).

128266673 is an equidigital number, since it uses as much as digits as its factorization.

128266673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 128266673 is about 11325.4877599157. The cubic root of 128266673 is about 504.3181635684.

The spelling of 128266673 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, six hundred seventy-three".