648668978947 has 16 divisors (see below), whose sum is σ = 708353942400. Its totient is φ = 589103504640.

The previous prime is 648668978941. The next prime is 648668978957. The reversal of 648668978947 is 749879866846.

It is a cyclic number.

It is not a de Polignac number, because 648668978947 - 2⁷ = 648668978819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648668978941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61602579 + ... + 61613107.

It is an arithmetic number, because the mean of its divisors is an integer number (44272121400).

Almost surely, 2^648668978947 is an apocalyptic number.

648668978947 is a deficient number, since it is larger than the sum of its proper divisors (59684963453).

648668978947 is a wasteful number, since it uses less digits than its factorization.

648668978947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15666.

The product of its digits is 7023034368, while the sum is 82.

The spelling of 648668978947 in words is "six hundred forty-eight billion, six hundred sixty-eight million, nine hundred seventy-eight thousand, nine hundred forty-seven".