2006665156605 has 16 divisors (see below), whose sum is σ = 3215752481664. Its totient is φ = 1068525339840.

The previous prime is 2006665156591. The next prime is 2006665156633. The reversal of 2006665156605 is 5066515666002.

It is not a de Polignac number, because 2006665156605 - 2³⁷ = 1869226203133 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 105995034 + ... + 106013963.

It is an arithmetic number, because the mean of its divisors is an integer number (200984530104).

Almost surely, 2^{2006665156605} is an apocalyptic number.

It is an amenable number.

2006665156605 is a deficient number, since it is larger than the sum of its proper divisors (1209087325059).

2006665156605 is a wasteful number, since it uses less digits than its factorization.

2006665156605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212009636.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 2006665156605 in words is "two trillion, six billion, six hundred sixty-five million, one hundred fifty-six thousand, six hundred five".