66728082766 has 4 divisors (see below), whose sum is σ = 100092124152. Its totient is φ = 33364041382.

The previous prime is 66728082739. The next prime is 66728082767.

66728082766 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×66728082766² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66728082766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66728082767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16682020690 + ... + 16682020693.

It is an arithmetic number, because the mean of its divisors is an integer number (25023031038).

Almost surely, 2^66728082766 is an apocalyptic number.

66728082766 is a deficient number, since it is larger than the sum of its proper divisors (33364041386).

66728082766 is a wasteful number, since it uses less digits than its factorization.

66728082766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33364041385.

The product of its (nonzero) digits is 16257024, while the sum is 58.

The spelling of 66728082766 in words is "sixty-six billion, seven hundred twenty-eight million, eighty-two thousand, seven hundred sixty-six".