660675780813 has 4 divisors (see below), whose sum is σ = 880901041088. Its totient is φ = 440450520540.

The previous prime is 660675780811. The next prime is 660675780839. The reversal of 660675780813 is 318087576066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 660675780813 - 2¹ = 660675780811 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 (660675780811) 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, 110112630133 + ... + 110112630138.

It is an arithmetic number, because the mean of its divisors is an integer number (220225260272).

Almost surely, 2^660675780813 is an apocalyptic number.

It is an amenable number.

660675780813 is a deficient number, since it is larger than the sum of its proper divisors (220225260275).

660675780813 is a wasteful number, since it uses less digits than its factorization.

660675780813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220225260274.

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 660675780813 in words is "six hundred sixty billion, six hundred seventy-five million, seven hundred eighty thousand, eight hundred thirteen".