6466993679 has 4 divisors (see below), whose sum is σ = 6468022776. Its totient is φ = 6465964584.

The previous prime is 6466993661. The next prime is 6466993703. The reversal of 6466993679 is 9763996646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6466993679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6466993639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505064 + ... + 517709.

It is an arithmetic number, because the mean of its divisors is an integer number (1617005694).

Almost surely, 2^6466993679 is an apocalyptic number.

6466993679 is a deficient number, since it is larger than the sum of its proper divisors (1029097).

6466993679 is a wasteful number, since it uses less digits than its factorization.

6466993679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029096.

The product of its digits is 79361856, while the sum is 65.

The square root of 6466993679 is about 80417.6204509932. The cubic root of 6466993679 is about 1863.0913328216.

The spelling of 6466993679 in words is "six billion, four hundred sixty-six million, nine hundred ninety-three thousand, six hundred seventy-nine".