1606214165621 has 8 divisors (see below), whose sum is σ = 1831520225304. Its totient is φ = 1395443980800.

The previous prime is 1606214165581. The next prime is 1606214165639. The reversal of 1606214165621 is 1265614126061.

It can be written as a sum of positive squares in 4 ways, for example, as 199710672100 + 1406503493521 = 446890^2 + 1185961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606214165621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606214165671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3633968480 + ... + 3633968921.

It is an arithmetic number, because the mean of its divisors is an integer number (228940028163).

Almost surely, 2^{1606214165621} is an apocalyptic number.

It is an amenable number.

1606214165621 is a deficient number, since it is larger than the sum of its proper divisors (225306059683).

1606214165621 is a wasteful number, since it uses less digits than its factorization.

1606214165621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7267937431.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 1606214165621 in words is "one trillion, six hundred six billion, two hundred fourteen million, one hundred sixty-five thousand, six hundred twenty-one".