1668516851835 has 12 divisors (see below), whose sum is σ = 2892095876592. Its totient is φ = 889875654288.

The previous prime is 1668516851831. The next prime is 1668516851909. The reversal of 1668516851835 is 5381586158661.

1668516851835 is a `hidden beast` number, since 1 + 6 + 6 + 8 + 51 + 68 + 518 + 3 + 5 = 666.

It is not a de Polignac number, because 1668516851835 - 2² = 1668516851831 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668516851831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18539076087 + ... + 18539076176.

It is an arithmetic number, because the mean of its divisors is an integer number (241007989716).

Almost surely, 2^{1668516851835} is an apocalyptic number.

1668516851835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1668516851835 is a deficient number, since it is larger than the sum of its proper divisors (1223579024757).

1668516851835 is a wasteful number, since it uses less digits than its factorization.

1668516851835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37078152274 (or 37078152271 counting only the distinct ones).

The product of its digits is 41472000, while the sum is 63.

The spelling of 1668516851835 in words is "one trillion, six hundred sixty-eight billion, five hundred sixteen million, eight hundred fifty-one thousand, eight hundred thirty-five".