8025681866 has 4 divisors (see below), whose sum is σ = 12038522802. Its totient is φ = 4012840932.

The previous prime is 8025681799. The next prime is 8025681887. The reversal of 8025681866 is 6681865208.

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., 7811908225 + 213773641 = 88385^2 + 14621^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2006420465 + ... + 2006420468.

Almost surely, 2^8025681866 is an apocalyptic number.

8025681866 is a deficient number, since it is larger than the sum of its proper divisors (4012840936).

8025681866 is a wasteful number, since it uses less digits than its factorization.

8025681866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012840935.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The square root of 8025681866 is about 89586.1700598926. The cubic root of 8025681866 is about 2002.1378694429.

The spelling of 8025681866 in words is "eight billion, twenty-five million, six hundred eighty-one thousand, eight hundred sixty-six".