1606166236021 has 4 divisors (see below), whose sum is σ = 1606868540992. Its totient is φ = 1605463931052.

The previous prime is 1606166236001. The next prime is 1606166236033. The reversal of 1606166236021 is 1206326616061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1606166236021 - 2²¹ = 1606164138869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606166236001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351149055 + ... + 351153628.

It is an arithmetic number, because the mean of its divisors is an integer number (401717135248).

Almost surely, 2^{1606166236021} is an apocalyptic number.

It is an amenable number.

1606166236021 is a deficient number, since it is larger than the sum of its proper divisors (702304971).

1606166236021 is an equidigital number, since it uses as much as digits as its factorization.

1606166236021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702304970.

The product of its (nonzero) digits is 93312, while the sum is 40.

The spelling of 1606166236021 in words is "one trillion, six hundred six billion, one hundred sixty-six million, two hundred thirty-six thousand, twenty-one".