128026686266 has 4 divisors (see below), whose sum is σ = 192040029402. Its totient is φ = 64013343132.

The previous prime is 128026686239. The next prime is 128026686269. The reversal of 128026686266 is 662686620821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662686620821 = 109 ⋅6079693769.

It can be written as a sum of positive squares in only one way, i.e., 126253013041 + 1773673225 = 355321^2 + 42115^2 .

It is not an unprimeable number, because it can be changed into a prime (128026686269) 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, 32006671565 + ... + 32006671568.

Almost surely, 2^128026686266 is an apocalyptic number.

128026686266 is a deficient number, since it is larger than the sum of its proper divisors (64013343136).

128026686266 is an equidigital number, since it uses as much as digits as its factorization.

128026686266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64013343135.

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 128026686266 in words is "one hundred twenty-eight billion, twenty-six million, six hundred eighty-six thousand, two hundred sixty-six".