1278906945195 has 16 divisors (see below), whose sum is σ = 2232273940992. Its totient is φ = 620076094560.

The previous prime is 1278906945191. The next prime is 1278906945203. The reversal of 1278906945195 is 5915496098721.

It is a happy number.

It is not a de Polignac number, because 1278906945195 - 2² = 1278906945191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278906945191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3875475427 + ... + 3875475756.

It is an arithmetic number, because the mean of its divisors is an integer number (139517121312).

Almost surely, 2^{1278906945195} is an apocalyptic number.

1278906945195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1278906945195 is a deficient number, since it is larger than the sum of its proper divisors (953366995797).

1278906945195 is a wasteful number, since it uses less digits than its factorization.

1278906945195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7750951202.

The product of its (nonzero) digits is 48988800, while the sum is 66.

The spelling of 1278906945195 in words is "one trillion, two hundred seventy-eight billion, nine hundred six million, nine hundred forty-five thousand, one hundred ninety-five".