1606217363666 has 8 divisors (see below), whose sum is σ = 2409818865660. Its totient is φ = 802944408448.

The previous prime is 1606217363609. The next prime is 1606217363669. The reversal of 1606217363666 is 6663637126061.

It can be written as a sum of positive squares in 2 ways, for example, as 1538396183041 + 67821180625 = 1240321^2 + 260425^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1606217363669) 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, 82124471 + ... + 82144026.

Almost surely, 2^{1606217363666} is an apocalyptic number.

1606217363666 is a deficient number, since it is larger than the sum of its proper divisors (803601501994).

1606217363666 is a wasteful number, since it uses less digits than its factorization.

1606217363666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164273388.

The product of its (nonzero) digits is 5878656, while the sum is 53.

The spelling of 1606217363666 in words is "one trillion, six hundred six billion, two hundred seventeen million, three hundred sixty-three thousand, six hundred sixty-six".