128126523556 has 12 divisors (see below), whose sum is σ = 225019359180. Its totient is φ = 63835278080.

The previous prime is 128126523529. The next prime is 128126523583. The reversal of 128126523556 is 655325621821.

It is an interprime number because it is at equal distance from previous prime (128126523529) and next prime (128126523583).

It can be written as a sum of positive squares in 2 ways, for example, as 42638120100 + 85488403456 = 206490^2 + 292384^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56994661 + ... + 56996908.

It is an arithmetic number, because the mean of its divisors is an integer number (18751613265).

Almost surely, 2^128126523556 is an apocalyptic number.

It is an amenable number.

128126523556 is a deficient number, since it is larger than the sum of its proper divisors (96892835624).

128126523556 is a wasteful number, since it uses less digits than its factorization.

128126523556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113991854 (or 113991852 counting only the distinct ones).

The product of its digits is 864000, while the sum is 46.

The spelling of 128126523556 in words is "one hundred twenty-eight billion, one hundred twenty-six million, five hundred twenty-three thousand, five hundred fifty-six".