66513712205522 has 8 divisors (see below), whose sum is σ = 100027047919500. Its totient is φ = 33171362899024.

The previous prime is 66513712205503. The next prime is 66513712205561. The reversal of 66513712205522 is 22550221731566.

It can be written as a sum of positive squares in 2 ways, for example, as 55633682522401 + 10880029683121 = 7458799^2 + 3298489^2 .

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

It is a super-2 number, since 2×66513712205522² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42746600897 + ... + 42746602452.

Almost surely, 2^{66513712205522} is an apocalyptic number.

66513712205522 is a deficient number, since it is larger than the sum of its proper divisors (33513335713978).

66513712205522 is a wasteful number, since it uses less digits than its factorization.

66513712205522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85493203740.

The product of its (nonzero) digits is 1512000, while the sum is 47.

The spelling of 66513712205522 in words is "sixty-six trillion, five hundred thirteen billion, seven hundred twelve million, two hundred five thousand, five hundred twenty-two".