66755127537321 has 16 divisors (see below), whose sum is σ = 89095918766400. Its totient is φ = 44458878537920.

The previous prime is 66755127537317. The next prime is 66755127537349. The reversal of 66755127537321 is 12373572155766.

It is a cyclic number.

It is not a de Polignac number, because 66755127537321 - 2² = 66755127537317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66755127537361) 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, 384228130 + ... + 384401828.

It is an arithmetic number, because the mean of its divisors is an integer number (5568494922900).

Almost surely, 2^{66755127537321} is an apocalyptic number.

It is an amenable number.

66755127537321 is a deficient number, since it is larger than the sum of its proper divisors (22340791229079).

66755127537321 is a wasteful number, since it uses less digits than its factorization.

66755127537321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301176.

The product of its digits is 55566000, while the sum is 60.

The spelling of 66755127537321 in words is "sixty-six trillion, seven hundred fifty-five billion, one hundred twenty-seven million, five hundred thirty-seven thousand, three hundred twenty-one".