66800674013 has 4 divisors (see below), whose sum is σ = 69705051168. Its totient is φ = 63896296860.

The previous prime is 66800674001. The next prime is 66800674027. The reversal of 66800674013 is 31047600866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31047600866 = 2 ⋅15523800433.

It is a cyclic number.

It is not a de Polignac number, because 66800674013 - 2²² = 66796479709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66802674013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1452188543 + ... + 1452188588.

It is an arithmetic number, because the mean of its divisors is an integer number (17426262792).

Almost surely, 2^66800674013 is an apocalyptic number.

It is an amenable number.

66800674013 is a deficient number, since it is larger than the sum of its proper divisors (2904377155).

66800674013 is a wasteful number, since it uses less digits than its factorization.

66800674013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904377154.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 66800674013 in words is "sixty-six billion, eight hundred million, six hundred seventy-four thousand, thirteen".