128165800520 has 32 divisors (see below), whose sum is σ = 292434649920. Its totient is φ = 50544258240.

The previous prime is 128165800423. The next prime is 128165800537. The reversal of 128165800520 is 25008561821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22561562 + ... + 22567241.

It is an arithmetic number, because the mean of its divisors is an integer number (9138582810).

Almost surely, 2^128165800520 is an apocalyptic number.

128165800520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128165800520 is an abundant number, since it is smaller than the sum of its proper divisors (164268849400).

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

128165800520 is a wasteful number, since it uses less digits than its factorization.

128165800520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45128885 (or 45128881 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The spelling of 128165800520 in words is "one hundred twenty-eight billion, one hundred sixty-five million, eight hundred thousand, five hundred twenty".