66630905249 has 4 divisors (see below), whose sum is σ = 68431740564. Its totient is φ = 64830069936.

The previous prime is 66630905239. The next prime is 66630905251. The reversal of 66630905249 is 94250903666.

66630905249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44110500625 + 22520404624 = 210025^2 + 150068^2 .

It is a cyclic number.

It is not a de Polignac number, because 66630905249 - 2²⁴ = 66614128033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66630905197 and 66630905206.

It is not an unprimeable number, because it can be changed into a prime (66630905239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900417602 + ... + 900417675.

It is an arithmetic number, because the mean of its divisors is an integer number (17107935141).

Almost surely, 2^66630905249 is an apocalyptic number.

It is an amenable number.

66630905249 is a deficient number, since it is larger than the sum of its proper divisors (1800835315).

66630905249 is a wasteful number, since it uses less digits than its factorization.

66630905249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800835314.

The product of its (nonzero) digits is 2099520, while the sum is 50.

The spelling of 66630905249 in words is "sixty-six billion, six hundred thirty million, nine hundred five thousand, two hundred forty-nine".