1285701684866 has 4 divisors (see below), whose sum is σ = 1928552527302. Its totient is φ = 642850842432.

The previous prime is 1285701684863. The next prime is 1285701684871. The reversal of 1285701684866 is 6684861075821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 904821390841 + 380880294025 = 951221^2 + 617155^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1285701684799 and 1285701684808.

It is not an unprimeable number, because it can be changed into a prime (1285701684863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321425421215 + ... + 321425421218.

Almost surely, 2^{1285701684866} is an apocalyptic number.

1285701684866 is a deficient number, since it is larger than the sum of its proper divisors (642850842436).

1285701684866 is an equidigital number, since it uses as much as digits as its factorization.

1285701684866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642850842435.

The product of its (nonzero) digits is 30965760, while the sum is 62.

The spelling of 1285701684866 in words is "one trillion, two hundred eighty-five billion, seven hundred one million, six hundred eighty-four thousand, eight hundred sixty-six".