1985351866 has 8 divisors (see below), whose sum is σ = 3013907904. Its totient is φ = 980715900.

The previous prime is 1985351791. The next prime is 1985351867. The reversal of 1985351866 is 6681535891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1985351867) 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, 5979810 + ... + 5980141.

It is an arithmetic number, because the mean of its divisors is an integer number (376738488).

Almost surely, 2^1985351866 is an apocalyptic number.

1985351866 is a deficient number, since it is larger than the sum of its proper divisors (1028556038).

1985351866 is a wasteful number, since it uses less digits than its factorization.

1985351866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11960036.

The product of its digits is 1555200, while the sum is 52.

The square root of 1985351866 is about 44557.2874623220. The cubic root of 1985351866 is about 1256.8375943915.

The spelling of 1985351866 in words is "one billion, nine hundred eighty-five million, three hundred fifty-one thousand, eight hundred sixty-six".