66506387689193 has 8 divisors (see below), whose sum is σ = 66526284527040. Its totient is φ = 66486491532720.

The previous prime is 66506387689177. The next prime is 66506387689199. The reversal of 66506387689193 is 39198678360566.

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 66506387689193 - 2⁴ = 66506387689177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66506387689199) 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, 248824418 + ... + 249091556.

It is an arithmetic number, because the mean of its divisors is an integer number (8315785565880).

Almost surely, 2^{66506387689193} is an apocalyptic number.

It is an amenable number.

66506387689193 is a deficient number, since it is larger than the sum of its proper divisors (19896837847).

66506387689193 is a wasteful number, since it uses less digits than its factorization.

66506387689193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340687.

The product of its (nonzero) digits is 2116316160, while the sum is 77.

The spelling of 66506387689193 in words is "sixty-six trillion, five hundred six billion, three hundred eighty-seven million, six hundred eighty-nine thousand, one hundred ninety-three".