6478895866 has 4 divisors (see below), whose sum is σ = 9718343802. Its totient is φ = 3239447932.

The previous prime is 6478895851. The next prime is 6478895867. The reversal of 6478895866 is 6685988746.

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., 6419374641 + 59521225 = 80121^2 + 7715^2 .

It is not an unprimeable number, because it can be changed into a prime (6478895867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1619723965 + ... + 1619723968.

Almost surely, 2^6478895866 is an apocalyptic number.

6478895866 is a deficient number, since it is larger than the sum of its proper divisors (3239447936).

6478895866 is a wasteful number, since it uses less digits than its factorization.

6478895866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3239447935.

The product of its digits is 139345920, while the sum is 67.

The square root of 6478895866 is about 80491.5887903823. The cubic root of 6478895866 is about 1864.2336086361.

The spelling of 6478895866 in words is "six billion, four hundred seventy-eight million, eight hundred ninety-five thousand, eight hundred sixty-six".