66605655166623 has 6 divisors (see below), whose sum is σ = 96208168574024. Its totient is φ = 44403770111076.

The previous prime is 66605655166613. The next prime is 66605655166637. The reversal of 66605655166623 is 32666155650666.

It is not a de Polignac number, because 66605655166623 - 2⁵ = 66605655166591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605655166613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3700314175915 + ... + 3700314175932.

Almost surely, 2^{66605655166623} is an apocalyptic number.

66605655166623 is a deficient number, since it is larger than the sum of its proper divisors (29602513407401).

66605655166623 is a wasteful number, since it uses less digits than its factorization.

66605655166623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7400628351853 (or 7400628351850 counting only the distinct ones).

The product of its (nonzero) digits is 209952000, while the sum is 63.

The spelling of 66605655166623 in words is "sixty-six trillion, six hundred five billion, six hundred fifty-five million, one hundred sixty-six thousand, six hundred twenty-three".