660861357122 has 18 divisors (see below), whose sum is σ = 1000338810393. Its totient is φ = 327442132192.

The previous prime is 660861357113. The next prime is 660861357127. The reversal of 660861357122 is 221753168066.

It can be written as a sum of positive squares in 2 ways, for example, as 417379310401 + 243482046721 = 646049^2 + 493439^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=574831.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660861357127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 129909263 + ... + 129914349.

Almost surely, 2^660861357122 is an apocalyptic number.

660861357122 is a deficient number, since it is larger than the sum of its proper divisors (339477453271).

660861357122 is an frugal number, since it uses more digits than its factorization.

660861357122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10402 (or 5202 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 660861357122 in words is "six hundred sixty billion, eight hundred sixty-one million, three hundred fifty-seven thousand, one hundred twenty-two".