66766803831 has 24 divisors (see below), whose sum is σ = 118696541600. Its totient is φ = 35217654336.

The previous prime is 66766803749. The next prime is 66766803839. The reversal of 66766803831 is 13830866766.

It is not a de Polignac number, because 66766803831 - 2³³ = 58176869239 is a prime.

It is a super-2 number, since 2×66766803831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66766803839) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40760356 + ... + 40761993.

Almost surely, 2^66766803831 is an apocalyptic number.

66766803831 is a deficient number, since it is larger than the sum of its proper divisors (51929737769).

66766803831 is a wasteful number, since it uses less digits than its factorization.

66766803831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81522375 (or 81522372 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 66766803831 in words is "sixty-six billion, seven hundred sixty-six million, eight hundred three thousand, eight hundred thirty-one".