66146851751 has 4 divisors (see below), whose sum is σ = 66337477032. Its totient is φ = 65956226472.

The previous prime is 66146851747. The next prime is 66146851753. The reversal of 66146851751 is 15715864166.

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 66146851751 - 2² = 66146851747 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 66146851751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66146851753) 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, 95312120 + ... + 95312813.

It is an arithmetic number, because the mean of its divisors is an integer number (16584369258).

Almost surely, 2^66146851751 is an apocalyptic number.

66146851751 is a deficient number, since it is larger than the sum of its proper divisors (190625281).

66146851751 is a wasteful number, since it uses less digits than its factorization.

66146851751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190625280.

The product of its digits is 1209600, while the sum is 50.

The spelling of 66146851751 in words is "sixty-six billion, one hundred forty-six million, eight hundred fifty-one thousand, seven hundred fifty-one".