1966685860 has 48 divisors (see below), whose sum is σ = 4233390336. Its totient is φ = 767112192.

The previous prime is 1966685857. The next prime is 1966685879. The reversal of 1966685860 is 685866691.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262324 + ... + 269716.

It is an arithmetic number, because the mean of its divisors is an integer number (88195632).

Almost surely, 2^1966685860 is an apocalyptic number.

1966685860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1966685860 is an abundant number, since it is smaller than the sum of its proper divisors (2266704476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1966685860 is a wasteful number, since it uses less digits than its factorization.

1966685860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732 (or 7730 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 55.

The square root of 1966685860 is about 44347.3320505304. The cubic root of 1966685860 is about 1252.8863136916.

The spelling of 1966685860 in words is "one billion, nine hundred sixty-six million, six hundred eighty-five thousand, eight hundred sixty".