8966552721 has 16 divisors (see below), whose sum is σ = 13665484800. Its totient is φ = 5122932048.

The previous prime is 8966552719. The next prime is 8966552729. The reversal of 8966552721 is 1272556698.

It is not a de Polignac number, because 8966552721 - 2¹ = 8966552719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8966552729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117490 + ... + 178148.

It is an arithmetic number, because the mean of its divisors is an integer number (854092800).

Almost surely, 2^8966552721 is an apocalyptic number.

It is an amenable number.

8966552721 is a deficient number, since it is larger than the sum of its proper divisors (4698932079).

8966552721 is a wasteful number, since it uses less digits than its factorization.

8966552721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67708.

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

The square root of 8966552721 is about 94691.8830787518. The cubic root of 8966552721 is about 2077.5038412466.

The spelling of 8966552721 in words is "eight billion, nine hundred sixty-six million, five hundred fifty-two thousand, seven hundred twenty-one".