66842400424866 has 32 divisors (see below), whose sum is σ = 146529139781376. Its totient is φ = 20159276298000.

The previous prime is 66842400424861. The next prime is 66842400424879.

66842400424866 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66842400424866² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66842400424861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2399899920 + ... + 2399927771.

It is an arithmetic number, because the mean of its divisors is an integer number (4579035618168).

Almost surely, 2^{66842400424866} is an apocalyptic number.

66842400424866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66842400424866 is an abundant number, since it is smaller than the sum of its proper divisors (79686739356510).

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

66842400424866 is a wasteful number, since it uses less digits than its factorization.

66842400424866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4799827918.

The product of its (nonzero) digits is 84934656, while the sum is 60.

The spelling of 66842400424866 in words is "sixty-six trillion, eight hundred forty-two billion, four hundred million, four hundred twenty-four thousand, eight hundred sixty-six".