9725640657224 has 8 divisors (see below), whose sum is σ = 18235576232310. Its totient is φ = 4862820328608.

The previous prime is 9725640657221. The next prime is 9725640657253. The reversal of 9725640657224 is 4227560465279.

It can be written as a sum of positive squares in only one way, i.e., 9709642960900 + 15997696324 = 3116030^2 + 126482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (9725640657221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607852541069 + ... + 607852541084.

Almost surely, 2^{9725640657224} is an apocalyptic number.

It is an amenable number.

9725640657224 is a deficient number, since it is larger than the sum of its proper divisors (8509935575086).

9725640657224 is a wasteful number, since it uses less digits than its factorization.

9725640657224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215705082159 (or 1215705082155 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 59.

The spelling of 9725640657224 in words is "nine trillion, seven hundred twenty-five billion, six hundred forty million, six hundred fifty-seven thousand, two hundred twenty-four".