1660809864 has 32 divisors (see below), whose sum is σ = 4745171520. Its totient is φ = 474517056.

The previous prime is 1660809863. The next prime is 1660809881. The reversal of 1660809864 is 4689080661.

It is not an unprimeable number, because it can be changed into a prime (1660809863) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4942719 + ... + 4943054.

It is an arithmetic number, because the mean of its divisors is an integer number (148286610).

Almost surely, 2^1660809864 is an apocalyptic number.

1660809864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1660809864 is an abundant number, since it is smaller than the sum of its proper divisors (3084361656).

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

1660809864 is a wasteful number, since it uses less digits than its factorization.

1660809864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9885789 (or 9885785 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 1660809864 is about 40753.0350280810. The cubic root of 1660809864 is about 1184.2406700467.

The spelling of 1660809864 in words is "one billion, six hundred sixty million, eight hundred nine thousand, eight hundred sixty-four".