66281316655 has 8 divisors (see below), whose sum is σ = 80431261200. Its totient is φ = 52429265856.

The previous prime is 66281316617. The next prime is 66281316683. The reversal of 66281316655 is 55661318266.

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 66281316655 - 2¹¹ = 66281314607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66281316599 and 66281316608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74472945 + ... + 74473834.

It is an arithmetic number, because the mean of its divisors is an integer number (10053907650).

Almost surely, 2^66281316655 is an apocalyptic number.

66281316655 is a deficient number, since it is larger than the sum of its proper divisors (14149944545).

66281316655 is a wasteful number, since it uses less digits than its factorization.

66281316655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148946873.

The product of its digits is 1555200, while the sum is 49.

The spelling of 66281316655 in words is "sixty-six billion, two hundred eighty-one million, three hundred sixteen thousand, six hundred fifty-five".