1666271666027 has 4 divisors (see below), whose sum is σ = 1666592787360. Its totient is φ = 1665950544696.

The previous prime is 1666271666021. The next prime is 1666271666057. The reversal of 1666271666027 is 7206661726661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666271666027 - 2¹⁸ = 1666271403883 is a prime.

It is a super-2 number, since 2×1666271666027² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666271666021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160552883 + ... + 160563260.

It is an arithmetic number, because the mean of its divisors is an integer number (416648196840).

Almost surely, 2^{1666271666027} is an apocalyptic number.

1666271666027 is a deficient number, since it is larger than the sum of its proper divisors (321121333).

1666271666027 is an equidigital number, since it uses as much as digits as its factorization.

1666271666027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321121332.

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 1666271666027 in words is "one trillion, six hundred sixty-six billion, two hundred seventy-one million, six hundred sixty-six thousand, twenty-seven".