128217688850 has 12 divisors (see below), whose sum is σ = 238484901354. Its totient is φ = 51287075520.

The previous prime is 128217688699. The next prime is 128217688861. The reversal of 128217688850 is 58886712821.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 125217607321 + 3000081529 = 353861^2 + 54773^2 .

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1282176839 + ... + 1282176938.

Almost surely, 2^128217688850 is an apocalyptic number.

128217688850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128217688850 is a deficient number, since it is larger than the sum of its proper divisors (110267212504).

128217688850 is a wasteful number, since it uses less digits than its factorization.

128217688850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564353789 (or 2564353784 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 56.

The spelling of 128217688850 in words is "one hundred twenty-eight billion, two hundred seventeen million, six hundred eighty-eight thousand, eight hundred fifty".