1606133867521 has 4 divisors (see below), whose sum is σ = 1606655512000. Its totient is φ = 1605612223044.

The previous prime is 1606133867497. The next prime is 1606133867581. The reversal of 1606133867521 is 1257683316061.

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 1606133867521 - 2¹¹ = 1606133865473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1606133867581) 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 3 ways as a sum of consecutive naturals, for example, 260817621 + ... + 260823778.

It is an arithmetic number, because the mean of its divisors is an integer number (401663878000).

Almost surely, 2^{1606133867521} is an apocalyptic number.

It is an amenable number.

1606133867521 is a deficient number, since it is larger than the sum of its proper divisors (521644479).

1606133867521 is an equidigital number, since it uses as much as digits as its factorization.

1606133867521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521644478.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 1606133867521 in words is "one trillion, six hundred six billion, one hundred thirty-three million, eight hundred sixty-seven thousand, five hundred twenty-one".