3666556663 has 24 divisors (see below), whose sum is σ = 4656505104. Its totient is φ = 2854857600.

The previous prime is 3666556609. The next prime is 3666556667.

3666556663 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3666556663 - 2¹³ = 3666548471 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3666556663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666556667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1281931 + ... + 1284787.

It is an arithmetic number, because the mean of its divisors is an integer number (194021046).

Almost surely, 2^3666556663 is an apocalyptic number.

3666556663 is a deficient number, since it is larger than the sum of its proper divisors (989948441).

3666556663 is a wasteful number, since it uses less digits than its factorization.

3666556663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263 (or 5256 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 52.

The square root of 3666556663 is about 60552.0987497543. The cubic root of 3666556663 is about 1542.0062488427.

The spelling of 3666556663 in words is "three billion, six hundred sixty-six million, five hundred fifty-six thousand, six hundred sixty-three".