128664676021267 has 4 divisors (see below), whose sum is σ = 131802838851096. Its totient is φ = 125526513191440.

The previous prime is 128664676021249. The next prime is 128664676021309. The reversal of 128664676021267 is 762120676466821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128664676021267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128664676021199 and 128664676021208.

It is not an unprimeable number, because it can be changed into a prime (128664676021207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1569081414853 + ... + 1569081414934.

It is an arithmetic number, because the mean of its divisors is an integer number (32950709712774).

Almost surely, 2^{128664676021267} is an apocalyptic number.

128664676021267 is a deficient number, since it is larger than the sum of its proper divisors (3138162829829).

128664676021267 is an equidigital number, since it uses as much as digits as its factorization.

128664676021267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138162829828.

The product of its (nonzero) digits is 97542144, while the sum is 64.

The spelling of 128664676021267 in words is "one hundred twenty-eight trillion, six hundred sixty-four billion, six hundred seventy-six million, twenty-one thousand, two hundred sixty-seven".