128157591857820 has 192 divisors, whose sum is σ = 421197907931136. Its totient is φ = 28500799380480.

The previous prime is 128157591857767. The next prime is 128157591857821. The reversal of 128157591857820 is 28758195751821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128157591857821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1038989350 + ... + 1039112690.

It is an arithmetic number, because the mean of its divisors is an integer number (2193739103808).

Almost surely, 2^{128157591857820} is an apocalyptic number.

128157591857820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128157591857820 is an abundant number, since it is smaller than the sum of its proper divisors (293040316073316).

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

128157591857820 is a wasteful number, since it uses less digits than its factorization.

128157591857820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190260 (or 190258 counting only the distinct ones).

The product of its (nonzero) digits is 112896000, while the sum is 69.

The spelling of 128157591857820 in words is "one hundred twenty-eight trillion, one hundred fifty-seven billion, five hundred ninety-one million, eight hundred fifty-seven thousand, eight hundred twenty".