1666885536 has 36 divisors (see below), whose sum is σ = 4740206562. Its totient is φ = 555628416.

The previous prime is 1666885511. The next prime is 1666885607. The reversal of 1666885536 is 6355886661.

It can be written as a sum of positive squares in only one way, i.e., 1379379600 + 287505936 = 37140^2 + 16956^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2893611 + ... + 2894186.

Almost surely, 2^1666885536 is an apocalyptic number.

1666885536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666885536 is an abundant number, since it is smaller than the sum of its proper divisors (3073321026).

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

1666885536 is a wasteful number, since it uses less digits than its factorization.

1666885536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5787813 (or 5787802 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The square root of 1666885536 is about 40827.5095493223. The cubic root of 1666885536 is about 1185.6829988828.

The spelling of 1666885536 in words is "one billion, six hundred sixty-six million, eight hundred eighty-five thousand, five hundred thirty-six".