1668501866835 has 48 divisors (see below), whose sum is σ = 2900934972000. Its totient is φ = 887144059392.

The previous prime is 1668501866831. The next prime is 1668501866903. The reversal of 1668501866835 is 5386681058661.

It is a happy number.

1668501866835 is a `hidden beast` number, since 1 + 6 + 68 + 501 + 8 + 6 + 68 + 3 + 5 = 666.

It is not a de Polignac number, because 1668501866835 - 2² = 1668501866831 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1668501866831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19750516 + ... + 19834814.

It is an arithmetic number, because the mean of its divisors is an integer number (60436145250).

Almost surely, 2^{1668501866835} is an apocalyptic number.

1668501866835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1668501866835 is a deficient number, since it is larger than the sum of its proper divisors (1232433105165).

1668501866835 is a wasteful number, since it uses less digits than its factorization.

1668501866835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85652 (or 85649 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 63.

The spelling of 1668501866835 in words is "one trillion, six hundred sixty-eight billion, five hundred one million, eight hundred sixty-six thousand, eight hundred thirty-five".