648399218544 has 400 divisors, whose sum is σ = 2415212845056. Its totient is φ = 162981849600.

The previous prime is 648399218539. The next prime is 648399218557. The reversal of 648399218544 is 445812993846.

648399218544 is a `hidden beast` number, since 6 + 4 + 83 + 9 + 9 + 2 + 1 + 8 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2988754 + ... + 3198350.

Almost surely, 2^648399218544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648399218544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1207606422528).

648399218544 is an abundant number, since it is smaller than the sum of its proper divisors (1766813626512).

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

648399218544 is a wasteful number, since it uses less digits than its factorization.

648399218544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209666 (or 209651 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 648399218544 in words is "six hundred forty-eight billion, three hundred ninety-nine million, two hundred eighteen thousand, five hundred forty-four".