9721557016 has 64 divisors (see below), whose sum is σ = 19709049600. Its totient is φ = 4481651328.

The previous prime is 9721556969. The next prime is 9721557017. The reversal of 9721557016 is 6107551279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721557017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4411771 + ... + 4413973.

It is an arithmetic number, because the mean of its divisors is an integer number (307953900).

Almost surely, 2^9721557016 is an apocalyptic number.

It is an amenable number.

9721557016 is an abundant number, since it is smaller than the sum of its proper divisors (9987492584).

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

9721557016 is a wasteful number, since it uses less digits than its factorization.

9721557016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3088 (or 3084 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 43.

The square root of 9721557016 is about 98597.9564494113. The cubic root of 9721557016 is about 2134.2499301035.

The spelling of 9721557016 in words is "nine billion, seven hundred twenty-one million, five hundred fifty-seven thousand, sixteen".