66680674811 has 4 divisors (see below), whose sum is σ = 67810855800. Its totient is φ = 65550493824.

The previous prime is 66680674787. The next prime is 66680674813. The reversal of 66680674811 is 11847608666.

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 66680674811 - 2⁶ = 66680674747 is a prime.

It is a super-3 number, since 3×66680674811³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66680674813) 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 3 ways as a sum of consecutive naturals, for example, 565090406 + ... + 565090523.

It is an arithmetic number, because the mean of its divisors is an integer number (16952713950).

Almost surely, 2^66680674811 is an apocalyptic number.

66680674811 is a deficient number, since it is larger than the sum of its proper divisors (1130180989).

66680674811 is a wasteful number, since it uses less digits than its factorization.

66680674811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130180988.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 66680674811 in words is "sixty-six billion, six hundred eighty million, six hundred seventy-four thousand, eight hundred eleven".