1685366866687 has 4 divisors (see below), whose sum is σ = 1926133561936. Its totient is φ = 1444600171440.

The previous prime is 1685366866661. The next prime is 1685366866717. The reversal of 1685366866687 is 7866686635861.

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

It is a cyclic number.

It is not a de Polignac number, because 1685366866687 - 2³⁵ = 1651007128319 is a prime.

It is a super-3 number, since 3×1685366866687³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685366866607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120383347614 + ... + 120383347627.

It is an arithmetic number, because the mean of its divisors is an integer number (481533390484).

Almost surely, 2^{1685366866687} is an apocalyptic number.

1685366866687 is a deficient number, since it is larger than the sum of its proper divisors (240766695249).

1685366866687 is an equidigital number, since it uses as much as digits as its factorization.

1685366866687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240766695248.

The product of its digits is 2508226560, while the sum is 76.

The spelling of 1685366866687 in words is "one trillion, six hundred eighty-five billion, three hundred sixty-six million, eight hundred sixty-six thousand, six hundred eighty-seven".