128669644945408 has 192 divisors, whose sum is σ = 299058209049600. Its totient is φ = 54202417643520.

The previous prime is 128669644945403. The next prime is 128669644945409. The reversal of 128669644945408 is 804549446966821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128669644945403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275839241 + ... + 1275940087.

It is an arithmetic number, because the mean of its divisors is an integer number (1557594838800).

Almost surely, 2^{128669644945408} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128669644945408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149529104524800).

128669644945408 is an abundant number, since it is smaller than the sum of its proper divisors (170388564104192).

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

128669644945408 is a wasteful number, since it uses less digits than its factorization.

128669644945408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102396 (or 102376 counting only the distinct ones).

The product of its (nonzero) digits is 2866544640, while the sum is 76.

The spelling of 128669644945408 in words is "one hundred twenty-eight trillion, six hundred sixty-nine billion, six hundred forty-four million, nine hundred forty-five thousand, four hundred eight".