66844426169 has 8 divisors (see below), whose sum is σ = 67321924800. Its totient is φ = 66367386000.

The previous prime is 66844426163. The next prime is 66844426193. The reversal of 66844426169 is 96162444866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66844426169 - 2⁴ = 66844426153 is a prime.

It is a super-2 number, since 2×66844426169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66844426163) 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 7 ways as a sum of consecutive naturals, for example, 180734 + ... + 407864.

It is an arithmetic number, because the mean of its divisors is an integer number (8415240600).

Almost surely, 2^66844426169 is an apocalyptic number.

It is an amenable number.

66844426169 is a deficient number, since it is larger than the sum of its proper divisors (477498631).

66844426169 is a wasteful number, since it uses less digits than its factorization.

66844426169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229231.

The product of its digits is 11943936, while the sum is 56.

The spelling of 66844426169 in words is "sixty-six billion, eight hundred forty-four million, four hundred twenty-six thousand, one hundred sixty-nine".