12866478345 has 64 divisors (see below), whose sum is σ = 26779092480. Its totient is φ = 5738342400.

The previous prime is 12866478341. The next prime is 12866478347. The reversal of 12866478345 is 54387466821.

It is a happy number.

12866478345 is a `hidden beast` number, since 128 + 6 + 6 + 478 + 3 + 45 = 666.

It is not a de Polignac number, because 12866478345 - 2² = 12866478341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12866478291 and 12866478300.

It is not an unprimeable number, because it can be changed into a prime (12866478341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 127296 + ... + 204785.

It is an arithmetic number, because the mean of its divisors is an integer number (418423320).

Almost surely, 2^12866478345 is an apocalyptic number.

12866478345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12866478345 is an abundant number, since it is smaller than the sum of its proper divisors (13912614135).

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

12866478345 is a wasteful number, since it uses less digits than its factorization.

12866478345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332143 (or 332137 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The spelling of 12866478345 in words is "twelve billion, eight hundred sixty-six million, four hundred seventy-eight thousand, three hundred forty-five".