1866866685 has 16 divisors (see below), whose sum is σ = 2987756160. Its totient is φ = 995405760.

The previous prime is 1866866681. The next prime is 1866866699. The reversal of 1866866685 is 5866686681.

It is not a de Polignac number, because 1866866685 - 2² = 1866866681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866866681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54015 + ... + 81555.

It is an arithmetic number, because the mean of its divisors is an integer number (186734760).

Almost surely, 2^1866866685 is an apocalyptic number.

1866866685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1866866685 is a deficient number, since it is larger than the sum of its proper divisors (1120889475).

1866866685 is a wasteful number, since it uses less digits than its factorization.

1866866685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32068.

The product of its digits is 19906560, while the sum is 60.

The square root of 1866866685 is about 43207.2526897973. The cubic root of 1866866685 is about 1231.3204769195.

The spelling of 1866866685 in words is "one billion, eight hundred sixty-six million, eight hundred sixty-six thousand, six hundred eighty-five".