660894973009 has 8 divisors (see below), whose sum is σ = 662013638312. Its totient is φ = 659776440960.

The previous prime is 660894973007. The next prime is 660894973033. The reversal of 660894973009 is 900379498066.

It can be written as a sum of positive squares in 4 ways, for example, as 97404537409 + 563490435600 = 312097^2 + 750660^2 .

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 660894973009 - 2¹ = 660894973007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660894973007) 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 7 ways as a sum of consecutive naturals, for example, 18151747 + ... + 18188119.

It is an arithmetic number, because the mean of its divisors is an integer number (82751704789).

Almost surely, 2^660894973009 is an apocalyptic number.

It is an amenable number.

660894973009 is a deficient number, since it is larger than the sum of its proper divisors (1118665303).

660894973009 is a wasteful number, since it uses less digits than its factorization.

660894973009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66627.

The product of its (nonzero) digits is 17635968, while the sum is 61.

The spelling of 660894973009 in words is "six hundred sixty billion, eight hundred ninety-four million, nine hundred seventy-three thousand, nine".