1217119420818 has 96 divisors (see below), whose sum is σ = 3053002208256. Its totient is φ = 343249350624.

The previous prime is 1217119420817. The next prime is 1217119420841. The reversal of 1217119420818 is 8180249117121.

1217119420818 is a `hidden beast` number, since 1 + 217 + 1 + 1 + 9 + 420 + 8 + 1 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1217119420817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3831505 + ... + 4136987.

It is an arithmetic number, because the mean of its divisors is an integer number (31802106336).

Almost surely, 2^{1217119420818} is an apocalyptic number.

1217119420818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1217119420818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1526501104128).

1217119420818 is an abundant number, since it is smaller than the sum of its proper divisors (1835882787438).

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

1217119420818 is a wasteful number, since it uses less digits than its factorization.

1217119420818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305908 (or 305905 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The spelling of 1217119420818 in words is "one trillion, two hundred seventeen billion, one hundred nineteen million, four hundred twenty thousand, eight hundred eighteen".