2135945666 has 4 divisors (see below), whose sum is σ = 3203918502. Its totient is φ = 1067972832.

The previous prime is 2135945627. The next prime is 2135945689. The reversal of 2135945666 is 6665495312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2031395041 + 104550625 = 45071^2 + 10225^2 .

It is a super-3 number, since 3×2135945666³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2135945666.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533986415 + ... + 533986418.

Almost surely, 2^2135945666 is an apocalyptic number.

2135945666 is a deficient number, since it is larger than the sum of its proper divisors (1067972836).

2135945666 is a wasteful number, since it uses less digits than its factorization.

2135945666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067972835.

The product of its digits is 1166400, while the sum is 47.

The square root of 2135945666 is about 46216.2922138936. The cubic root of 2135945666 is about 1287.8444191956.

The spelling of 2135945666 in words is "two billion, one hundred thirty-five million, nine hundred forty-five thousand, six hundred sixty-six".