660745353281 has 8 divisors (see below), whose sum is σ = 714762827520. Its totient is φ = 607183723152.

The previous prime is 660745353239. The next prime is 660745353353. The reversal of 660745353281 is 182353547066.

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

It is a cyclic number.

It is not a de Polignac number, because 660745353281 - 2⁶ = 660745353217 is a prime.

It is a super-2 number, since 2×660745353281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660745383281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113958011 + ... + 113963808.

It is an arithmetic number, because the mean of its divisors is an integer number (89345353440).

Almost surely, 2^660745353281 is an apocalyptic number.

It is an amenable number.

660745353281 is a deficient number, since it is larger than the sum of its proper divisors (54017474239).

660745353281 is a wasteful number, since it uses less digits than its factorization.

660745353281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227922055.

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 660745353281 in words is "six hundred sixty billion, seven hundred forty-five million, three hundred fifty-three thousand, two hundred eighty-one".