66766839061 has 8 divisors (see below), whose sum is σ = 71907359384. Its totient is φ = 61626977280.

The previous prime is 66766839053. The next prime is 66766839071. The reversal of 66766839061 is 16093866766.

It can be written as a sum of positive squares in 4 ways, for example, as 6781522500 + 59985316561 = 82350^2 + 244919^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66766839061 - 2³ = 66766839053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66766838987 and 66766839005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66766839071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57001 + ... + 369841.

It is an arithmetic number, because the mean of its divisors is an integer number (8988419923).

Almost surely, 2^66766839061 is an apocalyptic number.

It is an amenable number.

66766839061 is a deficient number, since it is larger than the sum of its proper divisors (5140520323).

66766839061 is a wasteful number, since it uses less digits than its factorization.

66766839061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329271.

The product of its (nonzero) digits is 11757312, while the sum is 58.

The spelling of 66766839061 in words is "sixty-six billion, seven hundred sixty-six million, eight hundred thirty-nine thousand, sixty-one".