648806399999 has 4 divisors (see below), whose sum is σ = 677015373936. Its totient is φ = 620597426064.

The previous prime is 648806399993. The next prime is 648806400023. The reversal of 648806399999 is 999993608846.

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

It is a cyclic number.

It is not a de Polignac number, because 648806399999 - 2¹² = 648806395903 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 (648806399993) 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, 14104486934 + ... + 14104486979.

It is an arithmetic number, because the mean of its divisors is an integer number (169253843484).

Almost surely, 2^648806399999 is an apocalyptic number.

648806399999 is a deficient number, since it is larger than the sum of its proper divisors (28208973937).

648806399999 is a wasteful number, since it uses less digits than its factorization.

648806399999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28208973936.

The product of its (nonzero) digits is 1632586752, while the sum is 80.

The spelling of 648806399999 in words is "six hundred forty-eight billion, eight hundred six million, three hundred ninety-nine thousand, nine hundred ninety-nine".