660220257607 has 4 divisors (see below), whose sum is σ = 660352650856. Its totient is φ = 660087864360.

The previous prime is 660220257577. The next prime is 660220257659. The reversal of 660220257607 is 706752022066.

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

It is a cyclic number.

It is not a de Polignac number, because 660220257607 - 2¹¹ = 660220255559 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 (660220267607) 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, 66189144 + ... + 66199117.

It is an arithmetic number, because the mean of its divisors is an integer number (165088162714).

Almost surely, 2^660220257607 is an apocalyptic number.

660220257607 is a deficient number, since it is larger than the sum of its proper divisors (132393249).

660220257607 is a wasteful number, since it uses less digits than its factorization.

660220257607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132393248.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 660220257607 in words is "six hundred sixty billion, two hundred twenty million, two hundred fifty-seven thousand, six hundred seven".