66644160203 has 4 divisors (see below), whose sum is σ = 68445353760. Its totient is φ = 64842966648.

The previous prime is 66644160199. The next prime is 66644160241. The reversal of 66644160203 is 30206144666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30206144666 = 2 ⋅15103072333.

It is a cyclic number.

It is not a de Polignac number, because 66644160203 - 2² = 66644160199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66644160263) 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 3 ways as a sum of consecutive naturals, for example, 900596723 + ... + 900596796.

It is an arithmetic number, because the mean of its divisors is an integer number (17111338440).

Almost surely, 2^66644160203 is an apocalyptic number.

66644160203 is a deficient number, since it is larger than the sum of its proper divisors (1801193557).

66644160203 is a wasteful number, since it uses less digits than its factorization.

66644160203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801193556.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 66644160203 in words is "sixty-six billion, six hundred forty-four million, one hundred sixty thousand, two hundred three".