66790111679 has 4 divisors (see below), whose sum is σ = 66808479384. Its totient is φ = 66771743976.

The previous prime is 66790111573. The next prime is 66790111691. The reversal of 66790111679 is 97611109766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97611109766 = 2 ⋅48805554883.

It is a cyclic number.

It is not a de Polignac number, because 66790111679 - 2²⁸ = 66521676223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66790111679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66790119679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9178397 + ... + 9185670.

It is an arithmetic number, because the mean of its divisors is an integer number (16702119846).

Almost surely, 2^66790111679 is an apocalyptic number.

66790111679 is a deficient number, since it is larger than the sum of its proper divisors (18367705).

66790111679 is a wasteful number, since it uses less digits than its factorization.

66790111679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18367704.

The product of its (nonzero) digits is 857304, while the sum is 53.

The spelling of 66790111679 in words is "sixty-six billion, seven hundred ninety million, one hundred eleven thousand, six hundred seventy-nine".