66785279135 has 4 divisors (see below), whose sum is σ = 80142334968. Its totient is φ = 53428223304.

The previous prime is 66785279107. The next prime is 66785279153. The reversal of 66785279135 is 53197258766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53197258766 = 2 ⋅26598629383.

It is a cyclic number.

It is not a de Polignac number, because 66785279135 - 2²⁰ = 66784230559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 6678527909 + ... + 6678527918.

It is an arithmetic number, because the mean of its divisors is an integer number (20035583742).

Almost surely, 2^66785279135 is an apocalyptic number.

66785279135 is a deficient number, since it is larger than the sum of its proper divisors (13357055833).

66785279135 is a wasteful number, since it uses less digits than its factorization.

66785279135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13357055832.

The product of its digits is 19051200, while the sum is 59.

The spelling of 66785279135 in words is "sixty-six billion, seven hundred eighty-five million, two hundred seventy-nine thousand, one hundred thirty-five".