648194973312 has 64 divisors (see below), whose sum is σ = 1796627396160. Its totient is φ = 206670858240.

The previous prime is 648194973311. The next prime is 648194973319. The reversal of 648194973312 is 213379491846.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (648194973311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36686989 + ... + 36704652.

It is an arithmetic number, because the mean of its divisors is an integer number (28072303065).

Almost surely, 2^648194973312 is an apocalyptic number.

It is an amenable number.

648194973312 is an abundant number, since it is smaller than the sum of its proper divisors (1148432422848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648194973312 is a wasteful number, since it uses less digits than its factorization.

648194973312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73391681 (or 73391669 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 57.

The spelling of 648194973312 in words is "six hundred forty-eight billion, one hundred ninety-four million, nine hundred seventy-three thousand, three hundred twelve".