66838483866 has 128 divisors (see below), whose sum is σ = 168356892672. Its totient is φ = 17184960000.

The previous prime is 66838483801. The next prime is 66838483871.

66838483866 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66838483797 and 66838483806.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21833976 + ... + 21837036.

It is an arithmetic number, because the mean of its divisors is an integer number (1315288224).

Almost surely, 2^66838483866 is an apocalyptic number.

66838483866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66838483866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84178446336).

66838483866 is an abundant number, since it is smaller than the sum of its proper divisors (101518408806).

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

66838483866 is a wasteful number, since it uses less digits than its factorization.

66838483866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548.

The product of its digits is 191102976, while the sum is 66.

The spelling of 66838483866 in words is "sixty-six billion, eight hundred thirty-eight million, four hundred eighty-three thousand, eight hundred sixty-six".