1001665506606 has 8 divisors (see below), whose sum is σ = 2003331013224. Its totient is φ = 333888502200.

The previous prime is 1001665506559. The next prime is 1001665506659. The reversal of 1001665506606 is 6066055661001.

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

1001665506606 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83472125545 + ... + 83472125556.

It is an arithmetic number, because the mean of its divisors is an integer number (250416376653).

Almost surely, 2^{1001665506606} is an apocalyptic number.

1001665506606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1001665506606 is a wasteful number, since it uses less digits than its factorization.

1001665506606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166944251106.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 1001665506606 in words is "one trillion, one billion, six hundred sixty-five million, five hundred six thousand, six hundred six".