128361918778 has 32 divisors (see below), whose sum is σ = 209188454400. Its totient is φ = 58880259504.

The previous prime is 128361918749. The next prime is 128361918781. The reversal of 128361918778 is 877819163821.

It is a super-3 number, since 3×128361918778³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277050 + ... + 577477.

It is an arithmetic number, because the mean of its divisors is an integer number (6537139200).

Almost surely, 2^128361918778 is an apocalyptic number.

128361918778 is a deficient number, since it is larger than the sum of its proper divisors (80826535622).

128361918778 is a wasteful number, since it uses less digits than its factorization.

128361918778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854674.

The product of its digits is 8128512, while the sum is 61.

The spelling of 128361918778 in words is "one hundred twenty-eight billion, three hundred sixty-one million, nine hundred eighteen thousand, seven hundred seventy-eight".