9856562721 has 8 divisors (see below), whose sum is σ = 13833772320. Its totient is φ = 6225197472.

The previous prime is 9856562713. The next prime is 9856562777. The reversal of 9856562721 is 1272656589.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9856562721 - 2³ = 9856562713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9856562701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86461020 + ... + 86461133.

It is an arithmetic number, because the mean of its divisors is an integer number (1729221540).

Almost surely, 2^9856562721 is an apocalyptic number.

It is an amenable number.

9856562721 is a deficient number, since it is larger than the sum of its proper divisors (3977209599).

9856562721 is a wasteful number, since it uses less digits than its factorization.

9856562721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172922175.

The product of its digits is 1814400, while the sum is 51.

The square root of 9856562721 is about 99280.2232118764. The cubic root of 9856562721 is about 2144.0841677974.

The spelling of 9856562721 in words is "nine billion, eight hundred fifty-six million, five hundred sixty-two thousand, seven hundred twenty-one".