66851080019 has 4 divisors (see below), whose sum is σ = 66851921640. Its totient is φ = 66850238400.

The previous prime is 66851080001. The next prime is 66851080057. The reversal of 66851080019 is 91008015866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66851080019 - 2¹² = 66851075923 is a prime.

It is a super-2 number, since 2×66851080019² (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 (66851080319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287609 + ... + 465210.

It is an arithmetic number, because the mean of its divisors is an integer number (16712980410).

Almost surely, 2^66851080019 is an apocalyptic number.

66851080019 is a deficient number, since it is larger than the sum of its proper divisors (841621).

66851080019 is an equidigital number, since it uses as much as digits as its factorization.

66851080019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841620.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 66851080019 in words is "sixty-six billion, eight hundred fifty-one million, eighty thousand, nineteen".