128361918777 has 16 divisors (see below), whose sum is σ = 173695961280. Its totient is φ = 84303977472.

The previous prime is 128361918749. The next prime is 128361918781. The reversal of 128361918777 is 777819163821.

It is not a de Polignac number, because 128361918777 - 2¹⁰ = 128361917753 is a prime.

It is a super-2 number, since 2×128361918777² (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 128361918777.

It is not an unprimeable number, because it can be changed into a prime (128361918077) by changing a digit.

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, 153048 + ... + 529289.

It is an arithmetic number, because the mean of its divisors is an integer number (10855997580).

Almost surely, 2^128361918777 is an apocalyptic number.

It is an amenable number.

128361918777 is a deficient number, since it is larger than the sum of its proper divisors (45334042503).

128361918777 is an equidigital number, since it uses as much as digits as its factorization.

128361918777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683272.

The product of its digits is 7112448, while the sum is 60.

The spelling of 128361918777 in words is "one hundred twenty-eight billion, three hundred sixty-one million, nine hundred eighteen thousand, seven hundred seventy-seven".