1666161616 has 40 divisors (see below), whose sum is σ = 3710726784. Its totient is φ = 709933440.

The previous prime is 1666161599. The next prime is 1666161617. The reversal of 1666161616 is 6161616661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666161617) 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, 23620 + ... + 62371.

Almost surely, 2^1666161616 is an apocalyptic number.

1666161616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666161616 is an abundant number, since it is smaller than the sum of its proper divisors (2044565168).

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

1666161616 is a wasteful number, since it uses less digits than its factorization.

1666161616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86179 (or 86173 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 1666161616 is about 40818.6429955725. The cubic root of 1666161616 is about 1185.5113286420.

The spelling of 1666161616 in words is "one billion, six hundred sixty-six million, one hundred sixty-one thousand, six hundred sixteen".