1278912512895 has 32 divisors (see below), whose sum is σ = 2135833228800. Its totient is φ = 652245753984.

The previous prime is 1278912512893. The next prime is 1278912512951. The reversal of 1278912512895 is 5982152198721.

It is a happy number.

It is not a de Polignac number, because 1278912512895 - 2¹ = 1278912512893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278912512893) 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 31 ways as a sum of consecutive naturals, for example, 697221 + ... + 1744689.

It is an arithmetic number, because the mean of its divisors is an integer number (66744788400).

Almost surely, 2^{1278912512895} is an apocalyptic number.

1278912512895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1278912512895 is a deficient number, since it is larger than the sum of its proper divisors (856920715905).

1278912512895 is a wasteful number, since it uses less digits than its factorization.

1278912512895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051039.

The product of its digits is 7257600, while the sum is 60.

The spelling of 1278912512895 in words is "one trillion, two hundred seventy-eight billion, nine hundred twelve million, five hundred twelve thousand, eight hundred ninety-five".