1668642602418 has 288 divisors, whose sum is σ = 4324999940352. Its totient is φ = 460529625600.

The previous prime is 1668642602399. The next prime is 1668642602437. The reversal of 1668642602418 is 8142062468661.

1668642602418 is a `hidden beast` number, since 1 + 66 + 86 + 4 + 260 + 241 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (1668642602399) and next prime (1668642602437).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 182141758 + ... + 182150918.

It is an arithmetic number, because the mean of its divisors is an integer number (15017360904).

Almost surely, 2^{1668642602418} is an apocalyptic number.

1668642602418 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 1668642602418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162499970176).

1668642602418 is an abundant number, since it is smaller than the sum of its proper divisors (2656357337934).

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

1668642602418 is a wasteful number, since it uses less digits than its factorization.

1668642602418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9310 (or 9284 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 54.

The spelling of 1668642602418 in words is "one trillion, six hundred sixty-eight billion, six hundred forty-two million, six hundred two thousand, four hundred eighteen".