1285078712985 has 24 divisors (see below), whose sum is σ = 2227740637824. Its totient is φ = 685291969440.

The previous prime is 1285078712941. The next prime is 1285078712989. The reversal of 1285078712985 is 5892178705821.

1285078712985 is a `hidden beast` number, since 1 + 28 + 507 + 8 + 7 + 1 + 29 + 85 = 666.

It is not a de Polignac number, because 1285078712985 - 2¹⁹ = 1285078188697 is a prime.

It is a super-2 number, since 2×1285078712985² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1285078712989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1361281 + ... + 2103150.

It is an arithmetic number, because the mean of its divisors is an integer number (92822526576).

Almost surely, 2^{1285078712985} is an apocalyptic number.

1285078712985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1285078712985 is a deficient number, since it is larger than the sum of its proper divisors (942661924839).

1285078712985 is a wasteful number, since it uses less digits than its factorization.

1285078712985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472685 (or 3472682 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 63.

The spelling of 1285078712985 in words is "one trillion, two hundred eighty-five billion, seventy-eight million, seven hundred twelve thousand, nine hundred eighty-five".