6651771566 has 16 divisors (see below), whose sum is σ = 11137851648. Its totient is φ = 2953217400.

The previous prime is 6651771551. The next prime is 6651771583.

6651771566 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent 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, 3514790 + ... + 3516681.

It is an arithmetic number, because the mean of its divisors is an integer number (696115728).

Almost surely, 2^6651771566 is an apocalyptic number.

6651771566 is a deficient number, since it is larger than the sum of its proper divisors (4486080082).

6651771566 is a wasteful number, since it uses less digits than its factorization.

6651771566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7031527.

The product of its digits is 1587600, while the sum is 50.

The square root of 6651771566 is about 81558.3935962449. The cubic root of 6651771566 is about 1880.6693299160.

The spelling of 6651771566 in words is "six billion, six hundred fifty-one million, seven hundred seventy-one thousand, five hundred sixty-six".