660644622444 has 48 divisors (see below), whose sum is σ = 1558858654080. Its totient is φ = 217744961280.

The previous prime is 660644622413. The next prime is 660644622527. The reversal of 660644622444 is 444226446066.

It is a junction number, because it is equal to n+sod(n) for n = 660644622393 and 660644622402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13222 + ... + 1149549.

It is an arithmetic number, because the mean of its divisors is an integer number (32476221960).

Almost surely, 2^660644622444 is an apocalyptic number.

It is an amenable number.

660644622444 is an abundant number, since it is smaller than the sum of its proper divisors (898214031636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660644622444 is a wasteful number, since it uses less digits than its factorization.

660644622444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163310 (or 1163308 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 660644622444 in words is "six hundred sixty billion, six hundred forty-four million, six hundred twenty-two thousand, four hundred forty-four".