65666155600656 has 60 divisors (see below), whose sum is σ = 197910496746508. Its totient is φ = 20204970953472.

The previous prime is 65666155600583. The next prime is 65666155600667. The reversal of 65666155600656 is 65600655166656.

It can be written as a sum of positive squares in 2 ways, for example, as 14687412397056 + 50978743203600 = 3832416^2 + 7139940^2 .

It is a super-2 number, since 2×65666155600656² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 65666155600593 and 65666155600602.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17539035415 + ... + 17539039158.

Almost surely, 2^{65666155600656} is an apocalyptic number.

It is an amenable number.

65666155600656 is an abundant number, since it is smaller than the sum of its proper divisors (132244341145852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65666155600656 is a wasteful number, since it uses less digits than its factorization.

65666155600656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35078074600 (or 35078074591 counting only the distinct ones).

The product of its (nonzero) digits is 174960000, while the sum is 63.

The spelling of 65666155600656 in words is "sixty-five trillion, six hundred sixty-six billion, one hundred fifty-five million, six hundred thousand, six hundred fifty-six".