66868155648 has 216 divisors, whose sum is σ = 220972752000. Its totient is φ = 19050319872.

The previous prime is 66868155617. The next prime is 66868155661. The reversal of 66868155648 is 84655186866.

66868155648 is a `hidden beast` number, since 6 + 6 + 8 + 68 + 1 + 5 + 564 + 8 = 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 23 ways as a sum of consecutive naturals, for example, 5784178 + ... + 5795726.

It is an arithmetic number, because the mean of its divisors is an integer number (1023022000).

Almost surely, 2^66868155648 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 66868155648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110486376000).

66868155648 is an abundant number, since it is smaller than the sum of its proper divisors (154104596352).

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

66868155648 is a wasteful number, since it uses less digits than its factorization.

66868155648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11937 (or 11920 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 63.

The spelling of 66868155648 in words is "sixty-six billion, eight hundred sixty-eight million, one hundred fifty-five thousand, six hundred forty-eight".