6471236666 has 4 divisors (see below), whose sum is σ = 9706855002. Its totient is φ = 3235618332.

The previous prime is 6471236647. The next prime is 6471236669. The reversal of 6471236666 is 6666321746.

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., 5727311041 + 743925625 = 75679^2 + 27275^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6471236666.

It is not an unprimeable number, because it can be changed into a prime (6471236669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1617809165 + ... + 1617809168.

Almost surely, 2^6471236666 is an apocalyptic number.

6471236666 is a deficient number, since it is larger than the sum of its proper divisors (3235618336).

6471236666 is a wasteful number, since it uses less digits than its factorization.

6471236666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235618335.

The product of its digits is 1306368, while the sum is 47.

The square root of 6471236666 is about 80443.9970787131. The cubic root of 6471236666 is about 1863.4987010925.

The spelling of 6471236666 in words is "six billion, four hundred seventy-one million, two hundred thirty-six thousand, six hundred sixty-six".