66104412353621 has 12 divisors (see below), whose sum is σ = 69778632790944. Its totient is φ = 62614527417000.

The previous prime is 66104412353569. The next prime is 66104412353641. The reversal of 66104412353621 is 12635321440166.

It is not a de Polignac number, because 66104412353621 - 2¹⁰ = 66104412352597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66104412353641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13535945 + ... + 17760366.

It is an arithmetic number, because the mean of its divisors is an integer number (5814886065912).

Almost surely, 2^{66104412353621} is an apocalyptic number.

It is an amenable number.

66104412353621 is a deficient number, since it is larger than the sum of its proper divisors (3674220437323).

66104412353621 is a wasteful number, since it uses less digits than its factorization.

66104412353621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31302200 (or 31302181 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

Adding to 66104412353621 its reverse (12635321440166), we get a palindrome (78739733793787).

The spelling of 66104412353621 in words is "sixty-six trillion, one hundred four billion, four hundred twelve million, three hundred fifty-three thousand, six hundred twenty-one".