1278313325085 has 32 divisors (see below), whose sum is σ = 2054458328832. Its totient is φ = 678720289280.

The previous prime is 1278313325063. The next prime is 1278313325087. The reversal of 1278313325085 is 5805233138721.

It is not a de Polignac number, because 1278313325085 - 2⁹ = 1278313324573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278313325087) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3546097 + ... + 3889913.

It is an arithmetic number, because the mean of its divisors is an integer number (64201822776).

Almost surely, 2^{1278313325085} is an apocalyptic number.

1278313325085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278313325085 is a deficient number, since it is larger than the sum of its proper divisors (776145003747).

1278313325085 is a wasteful number, since it uses less digits than its factorization.

1278313325085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344933.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 1278313325085 in words is "one trillion, two hundred seventy-eight billion, three hundred thirteen million, three hundred twenty-five thousand, eighty-five".