66255106605665 has 8 divisors (see below), whose sum is σ = 79507271675520. Its totient is φ = 53003322785392.

The previous prime is 66255106605661. The next prime is 66255106605671. The reversal of 66255106605665 is 56650660155266.

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

It is a cyclic number.

It is not a de Polignac number, because 66255106605665 - 2² = 66255106605661 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66255106605661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94929929 + ... + 95625318.

It is an arithmetic number, because the mean of its divisors is an integer number (9938408959440).

Almost surely, 2^{66255106605665} is an apocalyptic number.

It is an amenable number.

66255106605665 is a deficient number, since it is larger than the sum of its proper divisors (13252165069855).

66255106605665 is a wasteful number, since it uses less digits than its factorization.

66255106605665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190624791.

The product of its (nonzero) digits is 58320000, while the sum is 59.

The spelling of 66255106605665 in words is "sixty-six trillion, two hundred fifty-five billion, one hundred six million, six hundred five thousand, six hundred sixty-five".