648665989812 has 36 divisors (see below), whose sum is σ = 1658106892260. Its totient is φ = 213792534912.

The previous prime is 648665989799. The next prime is 648665989847. The reversal of 648665989812 is 218989566846.

648665989812 is a `hidden beast` number, since 6 + 486 + 6 + 59 + 8 + 98 + 1 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 457457438736 + 191208551076 = 676356^2 + 437274^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101224323 + ... + 101230730.

It is an arithmetic number, because the mean of its divisors is an integer number (46058524785).

Almost surely, 2^648665989812 is an apocalyptic number.

It is an amenable number.

648665989812 is an abundant number, since it is smaller than the sum of its proper divisors (1009440902448).

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

648665989812 is a wasteful number, since it uses less digits than its factorization.

648665989812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202455152 (or 202455147 counting only the distinct ones).

The product of its digits is 358318080, while the sum is 72.

The spelling of 648665989812 in words is "six hundred forty-eight billion, six hundred sixty-five million, nine hundred eighty-nine thousand, eight hundred twelve".