66111050566 has 16 divisors (see below), whose sum is σ = 109796374080. Its totient is φ = 29601962280.

The previous prime is 66111050561. The next prime is 66111050597. The reversal of 66111050566 is 66505011166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66111050561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22424256 + ... + 22427203.

It is an arithmetic number, because the mean of its divisors is an integer number (6862273380).

Almost surely, 2^66111050566 is an apocalyptic number.

66111050566 is a deficient number, since it is larger than the sum of its proper divisors (43685323514).

66111050566 is a wasteful number, since it uses less digits than its factorization.

66111050566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44851539.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 66111050566 in words is "sixty-six billion, one hundred eleven million, fifty thousand, five hundred sixty-six".