663840117724 has 24 divisors (see below), whose sum is σ = 1327982433120. Its totient is φ = 284438150976.

The previous prime is 663840117709. The next prime is 663840117727. The reversal of 663840117724 is 427711048366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663840117727) 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, 2572879 + ... + 2819110.

It is an arithmetic number, because the mean of its divisors is an integer number (55332601380).

Almost surely, 2^663840117724 is an apocalyptic number.

It is an amenable number.

663840117724 is an abundant number, since it is smaller than the sum of its proper divisors (664142315396).

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

663840117724 is a wasteful number, since it uses less digits than its factorization.

663840117724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5396397 (or 5396395 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 663840117724 in words is "six hundred sixty-three billion, eight hundred forty million, one hundred seventeen thousand, seven hundred twenty-four".