66042623126663 has 4 divisors (see below), whose sum is σ = 66485862208200. Its totient is φ = 65599384045128.

The previous prime is 66042623126651. The next prime is 66042623126687. The reversal of 66042623126663 is 36662132624066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66042623126663 - 2⁴ = 66042623126647 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 (66042623126603) 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, 221619540545 + ... + 221619540842.

It is an arithmetic number, because the mean of its divisors is an integer number (16621465552050).

Almost surely, 2^{66042623126663} is an apocalyptic number.

66042623126663 is a deficient number, since it is larger than the sum of its proper divisors (443239081537).

66042623126663 is a wasteful number, since it uses less digits than its factorization.

66042623126663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443239081536.

The product of its (nonzero) digits is 13436928, while the sum is 53.

The spelling of 66042623126663 in words is "sixty-six trillion, forty-two billion, six hundred twenty-three million, one hundred twenty-six thousand, six hundred sixty-three".