1217818869960 has 384 divisors, whose sum is σ = 4789017354240. Its totient is φ = 242050490880.

The previous prime is 1217818869959. The next prime is 1217818870003. The reversal of 1217818869960 is 699688187121.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 1217818869891 and 1217818869900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2077249 + ... + 2598191.

It is an arithmetic number, because the mean of its divisors is an integer number (12471399360).

Almost surely, 2^{1217818869960} is an apocalyptic number.

1217818869960 is a gapful number since it is divisible by the number (10) 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 1217818869960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2394508677120).

1217818869960 is an abundant number, since it is smaller than the sum of its proper divisors (3571198484280).

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

1217818869960 is a wasteful number, since it uses less digits than its factorization.

1217818869960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521009 (or 520994 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 66.

The spelling of 1217818869960 in words is "one trillion, two hundred seventeen billion, eight hundred eighteen million, eight hundred sixty-nine thousand, nine hundred sixty".