128128257136 has 40 divisors (see below), whose sum is σ = 273054742128. Its totient is φ = 58240107200.

The previous prime is 128128257133. The next prime is 128128257199. The reversal of 128128257136 is 631752821821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128128257133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2986975 + ... + 3029566.

Almost surely, 2^128128257136 is an apocalyptic number.

128128257136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128128257136 is an abundant number, since it is smaller than the sum of its proper divisors (144926484992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128128257136 is an equidigital number, since it uses as much as digits as its factorization.

128128257136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6016582 (or 6016554 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The spelling of 128128257136 in words is "one hundred twenty-eight billion, one hundred twenty-eight million, two hundred fifty-seven thousand, one hundred thirty-six".