1285705861218 has 12 divisors (see below), whose sum is σ = 2785696032678. Its totient is φ = 428568620400.

The previous prime is 1285705861123. The next prime is 1285705861243. The reversal of 1285705861218 is 8121685075821.

It is a happy number.

1285705861218 is a `hidden beast` number, since 1 + 2 + 8 + 5 + 7 + 0 + 5 + 8 + 612 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1257531231609 + 28174629609 = 1121397^2 + 167853^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35714051683 + ... + 35714051718.

Almost surely, 2^{1285705861218} is an apocalyptic number.

1285705861218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1285705861218 is an abundant number, since it is smaller than the sum of its proper divisors (1499990171460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1285705861218 is a wasteful number, since it uses less digits than its factorization.

1285705861218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71428103409 (or 71428103406 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 54.

The spelling of 1285705861218 in words is "one trillion, two hundred eighty-five billion, seven hundred five million, eight hundred sixty-one thousand, two hundred eighteen".