128725585668 has 24 divisors (see below), whose sum is σ = 333733000160. Its totient is φ = 42908528520.

The previous prime is 128725585643. The next prime is 128725585679. The reversal of 128725585668 is 866585527821.

It is a happy number.

128725585668 is a `hidden beast` number, since 1 + 2 + 8 + 72 + 558 + 5 + 6 + 6 + 8 = 666.

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, 595951678 + ... + 595951893.

Almost surely, 2^128725585668 is an apocalyptic number.

128725585668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128725585668 is an abundant number, since it is smaller than the sum of its proper divisors (205007414492).

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

128725585668 is a wasteful number, since it uses less digits than its factorization.

128725585668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191903584 (or 1191903576 counting only the distinct ones).

The product of its digits is 64512000, while the sum is 63.

The spelling of 128725585668 in words is "one hundred twenty-eight billion, seven hundred twenty-five million, five hundred eighty-five thousand, six hundred sixty-eight".