66052515221 has 16 divisors (see below), whose sum is σ = 82392576000. Its totient is φ = 51443624880.

The previous prime is 66052515169. The next prime is 66052515239. The reversal of 66052515221 is 12251525066.

It is a cyclic number.

It is not a de Polignac number, because 66052515221 - 2⁶ = 66052515157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66052515281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60641 + ... + 368486.

It is an arithmetic number, because the mean of its divisors is an integer number (5149536000).

Almost surely, 2^66052515221 is an apocalyptic number.

It is an amenable number.

66052515221 is a deficient number, since it is larger than the sum of its proper divisors (16340060779).

66052515221 is a wasteful number, since it uses less digits than its factorization.

66052515221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431144.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 66052515221 in words is "sixty-six billion, fifty-two million, five hundred fifteen thousand, two hundred twenty-one".