128147871856 has 20 divisors (see below), whose sum is σ = 248345593704. Its totient is φ = 64058686400.

The previous prime is 128147871851. The next prime is 128147871931. The reversal of 128147871856 is 658178741821.

It is a super-2 number, since 2×128147871856² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128147871856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128147871851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 883615 + ... + 1018366.

Almost surely, 2^128147871856 is an apocalyptic number.

128147871856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128147871856 is a deficient number, since it is larger than the sum of its proper divisors (120197721848).

128147871856 is a wasteful number, since it uses less digits than its factorization.

128147871856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906200 (or 1906194 counting only the distinct ones).

The product of its digits is 6021120, while the sum is 58.

The spelling of 128147871856 in words is "one hundred twenty-eight billion, one hundred forty-seven million, eight hundred seventy-one thousand, eight hundred fifty-six".