66666594061 has 8 divisors (see below), whose sum is σ = 67326118200. Its totient is φ = 66007941120.

The previous prime is 66666594019. The next prime is 66666594077. The reversal of 66666594061 is 16049566666.

It can be written as a sum of positive squares in 4 ways, for example, as 318622500 + 66347971561 = 17850^2 + 257581^2 .

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 66666594061 - 2²¹ = 66664496909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66666593993 and 66666594011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666594011) 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, 63460 + ... + 370621.

It is an arithmetic number, because the mean of its divisors is an integer number (8415764775).

Almost surely, 2^66666594061 is an apocalyptic number.

It is an amenable number.

66666594061 is a deficient number, since it is larger than the sum of its proper divisors (659524139).

66666594061 is a wasteful number, since it uses less digits than its factorization.

66666594061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435599.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 66666594061 in words is "sixty-six billion, six hundred sixty-six million, five hundred ninety-four thousand, sixty-one".