1666850001685 has 32 divisors (see below), whose sum is σ = 2262177953280. Its totient is φ = 1167924172800.

The previous prime is 1666850001679. The next prime is 1666850001697. The reversal of 1666850001685 is 5861000586661.

It is not a de Polignac number, because 1666850001685 - 2²⁹ = 1666313130773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 390076 + ... + 1867045.

It is an arithmetic number, because the mean of its divisors is an integer number (70693061040).

Almost surely, 2^{1666850001685} is an apocalyptic number.

It is an amenable number.

1666850001685 is a deficient number, since it is larger than the sum of its proper divisors (595327951595).

1666850001685 is a wasteful number, since it uses less digits than its factorization.

1666850001685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2257629.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 1666850001685 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty million, one thousand, six hundred eighty-five".