128656468715 has 8 divisors (see below), whose sum is σ = 154395609840. Its totient is φ = 102919943392.

The previous prime is 128656468711. The next prime is 128656468793. The reversal of 128656468715 is 517864656821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128656468715 - 2² = 128656468711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128656468711) 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 in 7 ways as a sum of consecutive naturals, for example, 544064 + ... + 743853.

It is an arithmetic number, because the mean of its divisors is an integer number (19299451230).

Almost surely, 2^128656468715 is an apocalyptic number.

128656468715 is a deficient number, since it is larger than the sum of its proper divisors (25739141125).

128656468715 is a wasteful number, since it uses less digits than its factorization.

128656468715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307901.

The product of its digits is 19353600, while the sum is 59.

The spelling of 128656468715 in words is "one hundred twenty-eight billion, six hundred fifty-six million, four hundred sixty-eight thousand, seven hundred fifteen".