66853388787 has 8 divisors (see below), whose sum is σ = 89172264960. Its totient is φ = 44551719240.

The previous prime is 66853388783. The next prime is 66853388837. The reversal of 66853388787 is 78788335866.

It is a happy number.

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

It is not a de Polignac number, because 66853388787 - 2² = 66853388783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66853388783) 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 7 ways as a sum of consecutive naturals, for example, 4292587 + ... + 4308132.

It is an arithmetic number, because the mean of its divisors is an integer number (11146533120).

Almost surely, 2^66853388787 is an apocalyptic number.

66853388787 is a deficient number, since it is larger than the sum of its proper divisors (22318876173).

66853388787 is a wasteful number, since it uses less digits than its factorization.

66853388787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8603313.

The product of its digits is 325140480, while the sum is 69.

The spelling of 66853388787 in words is "sixty-six billion, eight hundred fifty-three million, three hundred eighty-eight thousand, seven hundred eighty-seven".