1664405182027 has 16 divisors (see below), whose sum is σ = 1941091273152. Its totient is φ = 1397531566080.

The previous prime is 1664405181931. The next prime is 1664405182073. The reversal of 1664405182027 is 7202815044661.

It is a cyclic number.

It is not a de Polignac number, because 1664405182027 - 2¹⁵ = 1664405149259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664405182127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3261618 + ... + 3737239.

It is an arithmetic number, because the mean of its divisors is an integer number (121318204572).

Almost surely, 2^{1664405182027} is an apocalyptic number.

1664405182027 is a deficient number, since it is larger than the sum of its proper divisors (276686091125).

1664405182027 is an equidigital number, since it uses as much as digits as its factorization.

1664405182027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6999558.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 1664405182027 in words is "one trillion, six hundred sixty-four billion, four hundred five million, one hundred eighty-two thousand, twenty-seven".