12878415045909 has 24 divisors (see below), whose sum is σ = 21262981521600. Its totient is φ = 7357925789568.

The previous prime is 12878415045877. The next prime is 12878415045949. The reversal of 12878415045909 is 90954051487821.

12878415045909 is a `hidden beast` number, since 1 + 2 + 8 + 78 + 4 + 1 + 504 + 59 + 0 + 9 = 666.

It is not a de Polignac number, because 12878415045909 - 2⁵ = 12878415045877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12878415045949) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15829492 + ... + 16623165.

It is an arithmetic number, because the mean of its divisors is an integer number (885957563400).

Almost surely, 2^{12878415045909} is an apocalyptic number.

It is an amenable number.

12878415045909 is a deficient number, since it is larger than the sum of its proper divisors (8384566475691).

12878415045909 is a wasteful number, since it uses less digits than its factorization.

12878415045909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32458969 (or 32458966 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 63.

The spelling of 12878415045909 in words is "twelve trillion, eight hundred seventy-eight billion, four hundred fifteen million, forty-five thousand, nine hundred nine".