1217778148368 has 200 divisors, whose sum is σ = 3679731000000. Its totient is φ = 388078200576.

The previous prime is 1217778148333. The next prime is 1217778148369. The reversal of 1217778148368 is 8638418777121.

1217778148368 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 77 + 81 + 483 + 6 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1217778148369) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 64942258 + ... + 64961006.

It is an arithmetic number, because the mean of its divisors is an integer number (18398655000).

Almost surely, 2^{1217778148368} is an apocalyptic number.

1217778148368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1217778148368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1839865500000).

1217778148368 is an abundant number, since it is smaller than the sum of its proper divisors (2461952851632).

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

1217778148368 is a wasteful number, since it uses less digits than its factorization.

1217778148368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20971 (or 20956 counting only the distinct ones).

The product of its digits is 25288704, while the sum is 63.

The spelling of 1217778148368 in words is "one trillion, two hundred seventeen billion, seven hundred seventy-eight million, one hundred forty-eight thousand, three hundred sixty-eight".