1666066161005 has 8 divisors (see below), whose sum is σ = 2037001646232. Its totient is φ = 1307704760128.

The previous prime is 1666066160999. The next prime is 1666066161029. The reversal of 1666066161005 is 5001616606661.

It can be written as a sum of positive squares in 4 ways, for example, as 39801048004 + 1626265113001 = 199502^2 + 1275251^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1666066161005 - 2¹⁶ = 1666066095469 is a prime.

It is a super-2 number, since 2×1666066161005² (a number of 25 digits) contains 22 as substring.

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, 3143520794 + ... + 3143521323.

It is an arithmetic number, because the mean of its divisors is an integer number (254625205779).

Almost surely, 2^{1666066161005} is an apocalyptic number.

It is an amenable number.

1666066161005 is a deficient number, since it is larger than the sum of its proper divisors (370935485227).

1666066161005 is an equidigital number, since it uses as much as digits as its factorization.

1666066161005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6287042175.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 1666066161005 in words is "one trillion, six hundred sixty-six billion, sixty-six million, one hundred sixty-one thousand, five".