1606064521 has 4 divisors (see below), whose sum is σ = 1608887700. Its totient is φ = 1603241344.

The previous prime is 1606064503. The next prime is 1606064527. The reversal of 1606064521 is 1254606061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1254606061 = 3833 ⋅327317.

It can be written as a sum of positive squares in 2 ways, for example, as 737937225 + 868127296 = 27165^2 + 29464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606064521 - 2⁵ = 1606064489 is a prime.

It is a super-2 number, since 2×1606064521² = 5158886491229918882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1606064527) 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, 1410736 + ... + 1411873.

It is an arithmetic number, because the mean of its divisors is an integer number (402221925).

Almost surely, 2^1606064521 is an apocalyptic number.

It is an amenable number.

1606064521 is a deficient number, since it is larger than the sum of its proper divisors (2823179).

1606064521 is an equidigital number, since it uses as much as digits as its factorization.

1606064521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823178.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1606064521 is about 40075.7348154716. The cubic root of 1606064521 is about 1171.0829627615.

The spelling of 1606064521 in words is "one billion, six hundred six million, sixty-four thousand, five hundred twenty-one".