66785658766 has 4 divisors (see below), whose sum is σ = 100178488152. Its totient is φ = 33392829382.

The previous prime is 66785658733. The next prime is 66785658767.

66785658766 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 66785658695 and 66785658704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66785658767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16696414690 + ... + 16696414693.

It is an arithmetic number, because the mean of its divisors is an integer number (25044622038).

Almost surely, 2^66785658766 is an apocalyptic number.

66785658766 is a deficient number, since it is larger than the sum of its proper divisors (33392829386).

66785658766 is a wasteful number, since it uses less digits than its factorization.

66785658766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33392829385.

The product of its digits is 609638400, while the sum is 70.

The spelling of 66785658766 in words is "sixty-six billion, seven hundred eighty-five million, six hundred fifty-eight thousand, seven hundred sixty-six".