66766916653 has 4 divisors (see below), whose sum is σ = 66943083040. Its totient is φ = 66590750268.

The previous prime is 66766916647. The next prime is 66766916669. The reversal of 66766916653 is 35661966766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66766916653 - 2¹⁷ = 66766785581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66766916591 and 66766916600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66766910653) 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, 88082625 + ... + 88083382.

It is an arithmetic number, because the mean of its divisors is an integer number (16735770760).

Almost surely, 2^66766916653 is an apocalyptic number.

It is an amenable number.

66766916653 is a deficient number, since it is larger than the sum of its proper divisors (176166387).

66766916653 is a wasteful number, since it uses less digits than its factorization.

66766916653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176166386.

The product of its digits is 44089920, while the sum is 61.

The spelling of 66766916653 in words is "sixty-six billion, seven hundred sixty-six million, nine hundred sixteen thousand, six hundred fifty-three".