66647344374666 has 48 divisors (see below), whose sum is σ = 157895585947008. Its totient is φ = 20149306084800.

The previous prime is 66647344374661. The next prime is 66647344374683.

66647344374666 is nontrivially palindromic in base 10.

66647344374666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66647344374666² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66647344374594 and 66647344374603.

It is not an unprimeable number, because it can be changed into a prime (66647344374661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 390405091 + ... + 390575766.

It is an arithmetic number, because the mean of its divisors is an integer number (3289491373896).

Almost surely, 2^{66647344374666} is an apocalyptic number.

66647344374666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66647344374666 is an abundant number, since it is smaller than the sum of its proper divisors (91248241572342).

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

66647344374666 is a wasteful number, since it uses less digits than its factorization.

66647344374666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780981307 (or 780981304 counting only the distinct ones).

The product of its digits is 5267275776, while the sum is 72.

The spelling of 66647344374666 in words is "sixty-six trillion, six hundred forty-seven billion, three hundred forty-four million, three hundred seventy-four thousand, six hundred sixty-six".