66823555532866 has 16 divisors (see below), whose sum is σ = 109513565995680. Its totient is φ = 30328251849280.

The previous prime is 66823555532821. The next prime is 66823555532933.

66823555532866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66823555532795 and 66823555532804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2304563911 + ... + 2304592906.

It is an arithmetic number, because the mean of its divisors is an integer number (6844597874730).

Almost surely, 2^{66823555532866} is an apocalyptic number.

66823555532866 is a deficient number, since it is larger than the sum of its proper divisors (42690010462814).

66823555532866 is a wasteful number, since it uses less digits than its factorization.

66823555532866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4609157489.

The product of its digits is 1866240000, while the sum is 70.

The spelling of 66823555532866 in words is "sixty-six trillion, eight hundred twenty-three billion, five hundred fifty-five million, five hundred thirty-two thousand, eight hundred sixty-six".