66859522661 has 8 divisors (see below), whose sum is σ = 66976381824. Its totient is φ = 66742764480.

The previous prime is 66859522651. The next prime is 66859522663. The reversal of 66859522661 is 16622595866.

66859522661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66859522661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66859522597 and 66859522606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66859522663) 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, 1366226 + ... + 1414316.

It is an arithmetic number, because the mean of its divisors is an integer number (8372047728).

Almost surely, 2^66859522661 is an apocalyptic number.

It is an amenable number.

66859522661 is a deficient number, since it is larger than the sum of its proper divisors (116859163).

66859522661 is a wasteful number, since it uses less digits than its factorization.

66859522661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50491.

The product of its digits is 9331200, while the sum is 56.

The spelling of 66859522661 in words is "sixty-six billion, eight hundred fifty-nine million, five hundred twenty-two thousand, six hundred sixty-one".