12855435406778 has 8 divisors (see below), whose sum is σ = 19554746816160. Its totient is φ = 6337186468060.

The previous prime is 12855435406777. The next prime is 12855435406783. The reversal of 12855435406778 is 87760453455821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12855435406777) 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 3 ways as a sum of consecutive naturals, for example, 45265617488 + ... + 45265617771.

It is an arithmetic number, because the mean of its divisors is an integer number (2444343352020).

Almost surely, 2^{12855435406778} is an apocalyptic number.

12855435406778 is a deficient number, since it is larger than the sum of its proper divisors (6699311409382).

12855435406778 is an equidigital number, since it uses as much as digits as its factorization.

12855435406778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90531235332.

The product of its (nonzero) digits is 225792000, while the sum is 65.

The spelling of 12855435406778 in words is "twelve trillion, eight hundred fifty-five billion, four hundred thirty-five million, four hundred six thousand, seven hundred seventy-eight".