66166161085 has 8 divisors (see below), whose sum is σ = 79417726776. Its totient is φ = 52920706560.

The previous prime is 66166161073. The next prime is 66166161121. The reversal of 66166161085 is 58016166166.

It can be written as a sum of positive squares in 4 ways, for example, as 3476517444 + 62689643641 = 58962^2 + 250379^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66166161085 - 2¹⁷ = 66166030013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1503936 + ... + 1547305.

It is an arithmetic number, because the mean of its divisors is an integer number (9927215847).

Almost surely, 2^66166161085 is an apocalyptic number.

It is an amenable number.

66166161085 is a deficient number, since it is larger than the sum of its proper divisors (13251565691).

66166161085 is a wasteful number, since it uses less digits than its factorization.

66166161085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3055583.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 66166161085 in words is "sixty-six billion, one hundred sixty-six million, one hundred sixty-one thousand, eighty-five".