9993640657984 has 21 divisors (see below), whose sum is σ = 19831180866007. Its totient is φ = 4996807683904.

The previous prime is 9993640657943. The next prime is 9993640657993. The reversal of 9993640657984 is 4897560463999.

The square root of 9993640657984 is 3161272.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 25092597 + ... + 25487755.

Almost surely, 2^{9993640657984} is an apocalyptic number.

9993640657984 is the 3161272-nd square number.

It is an amenable number.

9993640657984 is a deficient number, since it is larger than the sum of its proper divisors (9837540208023).

9993640657984 is an frugal number, since it uses more digits than its factorization.

9993640657984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790330 (or 395161 counting only the distinct ones).

The product of its (nonzero) digits is 3174474240, while the sum is 79.

The spelling of 9993640657984 in words is "nine trillion, nine hundred ninety-three billion, six hundred forty million, six hundred fifty-seven thousand, nine hundred eighty-four".