1278912653895 has 16 divisors (see below), whose sum is σ = 2067355715040. Its totient is φ = 675054925824.

The previous prime is 1278912653891. The next prime is 1278912653897. The reversal of 1278912653895 is 5983562198721.

It is not a de Polignac number, because 1278912653895 - 2² = 1278912653891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278912653891) 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, 439487430 + ... + 439490339.

It is an arithmetic number, because the mean of its divisors is an integer number (129209732190).

Almost surely, 2^{1278912653895} is an apocalyptic number.

1278912653895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1278912653895 is a deficient number, since it is larger than the sum of its proper divisors (788443061145).

1278912653895 is an equidigital number, since it uses as much as digits as its factorization.

1278912653895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878977874.

The product of its digits is 65318400, while the sum is 66.

The spelling of 1278912653895 in words is "one trillion, two hundred seventy-eight billion, nine hundred twelve million, six hundred fifty-three thousand, eight hundred ninety-five".