128656053503 has 4 divisors (see below), whose sum is σ = 135427424760. Its totient is φ = 121884682248.

The previous prime is 128656053479. The next prime is 128656053509. The reversal of 128656053503 is 305350656821.

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

It is a cyclic number.

It is not a de Polignac number, because 128656053503 - 2³⁰ = 127582311679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128656053509) 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, 3385685600 + ... + 3385685637.

It is an arithmetic number, because the mean of its divisors is an integer number (33856856190).

Almost surely, 2^128656053503 is an apocalyptic number.

128656053503 is a deficient number, since it is larger than the sum of its proper divisors (6771371257).

128656053503 is an equidigital number, since it uses as much as digits as its factorization.

128656053503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6771371256.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 128656053503 in words is "one hundred twenty-eight billion, six hundred fifty-six million, fifty-three thousand, five hundred three".