213533532666 has 16 divisors (see below), whose sum is σ = 474518961600. Its totient is φ = 71177844204.

The previous prime is 213533532647. The next prime is 213533532679. The reversal of 213533532666 is 666235335312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1977162286 + ... + 1977162393.

It is an arithmetic number, because the mean of its divisors is an integer number (29657435100).

Almost surely, 2^213533532666 is an apocalyptic number.

213533532666 is an abundant number, since it is smaller than the sum of its proper divisors (260985428934).

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

213533532666 is a wasteful number, since it uses less digits than its factorization.

213533532666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954324690 (or 3954324684 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 45.

Adding to 213533532666 its reverse (666235335312), we get a palindrome (879768867978).

The spelling of 213533532666 in words is "two hundred thirteen billion, five hundred thirty-three million, five hundred thirty-two thousand, six hundred sixty-six".