66285775853903 has 4 divisors (see below), whose sum is σ = 67827305524968. Its totient is φ = 64744246182840.

The previous prime is 66285775853897. The next prime is 66285775853971. The reversal of 66285775853903 is 30935857758266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66285775853903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66285775853203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770764835468 + ... + 770764835553.

It is an arithmetic number, because the mean of its divisors is an integer number (16956826381242).

Almost surely, 2^{66285775853903} is an apocalyptic number.

66285775853903 is a deficient number, since it is larger than the sum of its proper divisors (1541529671065).

66285775853903 is a wasteful number, since it uses less digits than its factorization.

66285775853903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541529671064.

The product of its (nonzero) digits is 2286144000, while the sum is 74.

The spelling of 66285775853903 in words is "sixty-six trillion, two hundred eighty-five billion, seven hundred seventy-five million, eight hundred fifty-three thousand, nine hundred three".