66766916654 has 8 divisors (see below), whose sum is σ = 100335497448. Its totient is φ = 33321750840.

The previous prime is 66766916647. The next prime is 66766916669. The reversal of 66766916654 is 45661966766.

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

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, 30852392 + ... + 30854555.

It is an arithmetic number, because the mean of its divisors is an integer number (12541937181).

Almost surely, 2^66766916654 is an apocalyptic number.

66766916654 is a deficient number, since it is larger than the sum of its proper divisors (33568580794).

66766916654 is a wasteful number, since it uses less digits than its factorization.

66766916654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61707490.

The product of its digits is 58786560, while the sum is 62.

The spelling of 66766916654 in words is "sixty-six billion, seven hundred sixty-six million, nine hundred sixteen thousand, six hundred fifty-four".