128305681653556 has 96 divisors (see below), whose sum is σ = 246588832272384. Its totient is φ = 57931268400000.

The previous prime is 128305681653529. The next prime is 128305681653557. The reversal of 128305681653556 is 655356186503821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128305681653557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23214341665 + ... + 23214347191.

It is an arithmetic number, because the mean of its divisors is an integer number (2568633669504).

Almost surely, 2^{128305681653556} is an apocalyptic number.

It is an amenable number.

128305681653556 is a deficient number, since it is larger than the sum of its proper divisors (118283150618828).

128305681653556 is a wasteful number, since it uses less digits than its factorization.

128305681653556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101 (or 11099 counting only the distinct ones).

The product of its (nonzero) digits is 155520000, while the sum is 64.

The spelling of 128305681653556 in words is "one hundred twenty-eight trillion, three hundred five billion, six hundred eighty-one million, six hundred fifty-three thousand, five hundred fifty-six".