8945982721 has 6 divisors (see below), whose sum is σ = 9687070230. Its totient is φ = 8257830048.

The previous prime is 8945982701. The next prime is 8945982761. The reversal of 8945982721 is 1272895498.

It can be written as a sum of positive squares in 3 ways, for example, as 910832400 + 8035150321 = 30180^2 + 89639^2 .

It is not a de Polignac number, because 8945982721 - 2¹³ = 8945974529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8945982701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26467236 + ... + 26467573.

It is an arithmetic number, because the mean of its divisors is an integer number (1614511705).

Almost surely, 2^8945982721 is an apocalyptic number.

It is an amenable number.

8945982721 is a deficient number, since it is larger than the sum of its proper divisors (741087509).

8945982721 is a wasteful number, since it uses less digits than its factorization.

8945982721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52934835 (or 52934822 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 55.

The square root of 8945982721 is about 94583.2052797958. The cubic root of 8945982721 is about 2075.9139706957.

The spelling of 8945982721 in words is "eight billion, nine hundred forty-five million, nine hundred eighty-two thousand, seven hundred twenty-one".