3666666663 has 32 divisors (see below), whose sum is σ = 6086104320. Its totient is φ = 2162155680.

The previous prime is 3666666643. The next prime is 3666666673.

3666666663 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3666666663 - 2⁶ = 3666666599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666666623) 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 31 ways as a sum of consecutive naturals, for example, 155845 + ... + 177822.

It is an arithmetic number, because the mean of its divisors is an integer number (190190760).

Almost surely, 2^3666666663 is an apocalyptic number.

3666666663 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

3666666663 is a deficient number, since it is larger than the sum of its proper divisors (2419437657).

3666666663 is a wasteful number, since it uses less digits than its factorization.

3666666663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333724 (or 333718 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 54.

The square root of 3666666663 is about 60553.0070516733. The cubic root of 3666666663 is about 1542.0216692136.

It can be divided in two parts, 3 and 666666663, that added together give a palindrome (666666666).

The spelling of 3666666663 in words is "three billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-three".