648642365704 has 8 divisors (see below), whose sum is σ = 1216204435710. Its totient is φ = 324321182848.

The previous prime is 648642365687. The next prime is 648642365717. The reversal of 648642365704 is 407563246846.

It can be written as a sum of positive squares in only one way, i.e., 427179888100 + 221462477604 = 653590^2 + 470598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40540147849 + ... + 40540147864.

Almost surely, 2^648642365704 is an apocalyptic number.

It is an amenable number.

648642365704 is a deficient number, since it is larger than the sum of its proper divisors (567562070006).

648642365704 is a wasteful number, since it uses less digits than its factorization.

648642365704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81080295719 (or 81080295715 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 55.

The spelling of 648642365704 in words is "six hundred forty-eight billion, six hundred forty-two million, three hundred sixty-five thousand, seven hundred four".