1668518686692 has 336 divisors, whose sum is σ = 5180937939072. Its totient is φ = 463295946240.

The previous prime is 1668518686687. The next prime is 1668518686699. The reversal of 1668518686692 is 2966868158661.

1668518686692 is a `hidden beast` number, since 16 + 6 + 8 + 518 + 6 + 8 + 6 + 6 + 92 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1668518686692.

It is not an unprimeable number, because it can be changed into a prime (1668518686699) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 57112753 + ... + 57141959.

It is an arithmetic number, because the mean of its divisors is an integer number (15419458152).

Almost surely, 2^{1668518686692} is an apocalyptic number.

1668518686692 is a gapful number since it is divisible by the number (12) 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 1668518686692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2590468969536).

1668518686692 is an abundant number, since it is smaller than the sum of its proper divisors (3512419252380).

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

1668518686692 is a wasteful number, since it uses less digits than its factorization.

1668518686692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29390 (or 29373 counting only the distinct ones).

The product of its digits is 358318080, while the sum is 72.

The spelling of 1668518686692 in words is "one trillion, six hundred sixty-eight billion, five hundred eighteen million, six hundred eighty-six thousand, six hundred ninety-two".