66410262042521 has 16 divisors (see below), whose sum is σ = 69344599737600. Its totient is φ = 63518918832768.

The previous prime is 66410262042473. The next prime is 66410262042541. The reversal of 66410262042521 is 12524026201466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66410262042521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66410262042541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98989616 + ... + 99658238.

It is an arithmetic number, because the mean of its divisors is an integer number (4334037483600).

Almost surely, 2^{66410262042521} is an apocalyptic number.

It is an amenable number.

66410262042521 is a deficient number, since it is larger than the sum of its proper divisors (2934337695079).

66410262042521 is a wasteful number, since it uses less digits than its factorization.

66410262042521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700768.

The product of its (nonzero) digits is 276480, while the sum is 41.

Adding to 66410262042521 its reverse (12524026201466), we get a palindrome (78934288243987).

The spelling of 66410262042521 in words is "sixty-six trillion, four hundred ten billion, two hundred sixty-two million, forty-two thousand, five hundred twenty-one".