7211477666 has 8 divisors (see below), whose sum is σ = 10879744284. Its totient is φ = 3584896240.

The previous prime is 7211477657. The next prime is 7211477677. The reversal of 7211477666 is 6667741127.

It can be written as a sum of positive squares in 2 ways, for example, as 7120828225 + 90649441 = 84385^2 + 9521^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 7211477666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10420865 + ... + 10421556.

Almost surely, 2^7211477666 is an apocalyptic number.

7211477666 is a deficient number, since it is larger than the sum of its proper divisors (3668266618).

7211477666 is a wasteful number, since it uses less digits than its factorization.

7211477666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20842596.

The product of its digits is 592704, while the sum is 47.

The square root of 7211477666 is about 84920.4196056520. The cubic root of 7211477666 is about 1932.0042952708.

The spelling of 7211477666 in words is "seven billion, two hundred eleven million, four hundred seventy-seven thousand, six hundred sixty-six".